Re: How to parse a string completely into a list

[Tino Wildenhain]

[EMAIL PROTECTED] wrote:

On Sep 24, 10:12 pm, Matt Nordhoff <[EMAIL PROTECTED]> wrote:

[EMAIL PROTECTED] wrote:

On Sep 24, 9:44 pm, "Chris Rebert" <[EMAIL PROTECTED]> wrote:



Could you please define exactly what you mean by "elements" of a string?
If you mean characters, then just use list():>>> list("  \n \t abc")
[' ', ' ', '\n', ' ', '\t', ' ', 'a', 'b', 'c']
Regards,
Chris

Worked like a charm.
kudos!

Why do you need to convert it to a list? Strings are sequences, so you
can do things like slice them or iterate through them by character:


for character in "foo":

... print character
...
f
o
o

--


The string draws a map that I then want to be able to traverse
through. If I can count through the individual characters of a list I
can create an x-y coordinate plane for navigation.


You can 'count' (whatever that means) equally in strings as you do in
lists. As said above, they behave exactly the same. Just strings
are imutable - e.g. you can't change individual parts of them.

Tino



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smime.p7s
Description: S/MIME Cryptographic Signature
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Re: empty csv file attachments

[Peter Otten]

Bobby Roberts wrote:

> I'm new to python but a veteran at programming.  

Hm, your code doesn't show that. The time to read the tutorial would be time
well spend. After that, a quick look at what the standard library has to
offer wouldn't hurt. E. g. reading/writing CSV files is a solved problem in
python ;) 

> This one has me 
> stumped.  I have a simple contact form which the user fills out.  The
> email is sent to the site user as well and it is delivered with the
> content in the body of the email as well in nice order.  I have
> modified my code to also send the content as a csv attachment.  On the
> server, the file is perfectly generated with content.  The attachment,
> however, is completely blank.  Any ideas what that could be?  My code
> snippet is shown below:
> 
> 
>       if int(attachmenttype)==2 or int(attachmenttype)==3:
>         for field in ctx.request.field_names():
>           if field=='last_name':
>             myfilename=ctx.request.field_value(field)+'.txt'
>         if myfilename=='':
>           myfilename='tempfile.txt'
>         mypath= mynewfilepath + '/' + myfilename
>         f=open(mypath, 'w')
>         mynewstring=''
>         counter=0
>         for field in ctx.request.field_names():
>           if field != 'inquiry_required':
>             mynewstring=mynewstring + field +','
>         if mynewstring[-1]==',':
>           mynewstring=mynewstring[0:len(mynewstring)-1]
>         f.write(mynewstring)
>         f.write ('\n')
> 
>         mynewstring=''
>         counter=1
>         for field in ctx.request.field_names():
>           fielddata=ctx.request.field_value(field)
>           if counter==1:

Hm, above you skip the field "inquiry_required", here you skip the second
field.

>             dummydata=0
>           else:
>             mynewstring=mynewstring + '"' + fielddata.replace('"','')
> + '",'
>           counter = counter + 1
>         if mynewstring[-1]==',':
>           mynewstring=mynewstring[0:len(mynewstring)-1]
>         f.write(mynewstring)
>         f.write('\n')
>         f.close

Your actual problem might be that f.close doesn't close (and therefore
flush) the file, you need to call it with f.close().

>         attachments.append('/'.join((ctx.request.library,
> myfilename)))

Hm, is ctx.request.library the same as mynewfilepath?

With some guessing your code becomes (untested)

import csv
import os

if int(attachmenttype) in (2, 3):
filename = 'tempfile.txt'

if "last_name" in ctx.request.field_names():
last_name = ctx.request.field_value("last_name")
if last_name:
filename = last_name + ".txt"

path = os.path.join(ctx.request.library, filename)

f = open(path, 'wb')
writer = csv.writer(f)
fieldnames = [field for field in ctx.request.field_names()
  if field != "inquiry_required"]
writer.writerow(fieldnames)
writer.writerow(ctx.request.field_value(field) for field in fieldnames)
f.close()
attachments.append(path)

The code to build the filename is still clumsy, but to do better I'd have to
know the library you are using. Personally I'd always use "tempfile.txt"
and be done. This would also avoid fun with last names
like ../../just_testing_file_permissions.

Peter
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Re: Comparing float and decimal

[Tim Roberts]

Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote:
>
>On Tue, 23 Sep 2008 07:08:07 -0700, Michael Palmer wrote:
>
>>> > This seems to break the rule that if A is equal to B and B is equal
>>> > to C then A is equal to C.
>>>
>>> I don't see why transitivity should apply to Python objects in general.
>> 
>> Well, for numbers it surely would be a nice touch, wouldn't it. May be
>> the reason for Decimal to accept float arguments is that irrational
>> numbers or very long rational numbers cannot be converted to a Decimal
>> without rounding error, and Decimal doesn't want any part of it. Seems
>> pointless to me, though.
>
>Is 0.1 a very long number?  Would you expect ``0.1 == Decimal('0.1')`` to 
>be `True` or `False` given that 0.1 actually is
>
>In [98]: '%.50f' % 0.1
>Out[98]: '0.1555111512312578270211815834045410'
>?

Actually, it's not.  Your C run-time library is generating random digits
after it runs out of useful information (which is the first 16 or 17
digits).  0.1 in an IEEE 784 double is this:

 0.100088817841970012523233890533447265625
-- 
Tim Roberts, [EMAIL PROTECTED]
Providenza & Boekelheide, Inc.
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Connecting to SMB share in python

[Ronnie Kwok]

Hello,

I am trying to write a script that copy files from my local machine to a samba
share.

I've notice a library call Pysamba which is a wrapper on smb service but it
requires a compilation of SAMBA with some amendment in order to use it.

Are there alternative method that I could do the same thing?

Thank you for your advise.

ronnie

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Re: How to parse a string completely into a list

[Tim Roberts]

[EMAIL PROTECTED] wrote:
>
>The string draws a map that I then want to be able to traverse
>through. If I can count through the individual characters of a list I
>can create an x-y coordinate plane for navigation.

Well, the point Matt was making is that traversing through a list and
traversing through a string are the same.

  # Given this:
  s = 'abcde'
  l = ['a','b','c','d','e']

  # These are identical:
  for ch in s:
pass
  for ch in l:
pass

  # And these are identical:
  print s[3]
  print l[3]

Slicing is identical.  Subsetting is identical.  The only difference is
that I can change an element of the list.
-- 
Tim Roberts, [EMAIL PROTECTED]
Providenza & Boekelheide, Inc.
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python sorting 2dim. array ?

[fredo66]

hello,
Can someone help me with this:
I have a array like this

 list[rowindex][colomindex]

where rows are the records and colom the fields. If I use the .sort()
method on 'list' the data is sorted on the items of the first colom.
But I want to sort on the second colom as first (and as second
sortfield the first colom).

What is the shortest code for this pls ?

(all fields are text value, first colom is name, second category)
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Re: Python style: exceptions vs. sys.exit()

[Bruno Desthuilliers]

Steven D'Aprano a écrit :

On Wed, 24 Sep 2008 17:11:28 -0400, Ross Ridge wrote:


Plenty of people were quick to say that the exception should be passed
through to the caller.  No one said this behaviour should be documented.
 There may be little practical difference bewteen calling sys.exit()
after printing an error and progating an exception if no one using the
library knows that it could generate that exception in those
circumstances.


That's true, I didn't explicitly say that the library should be 
documented. Nor did I say that it shouldn't be riddled with bugs. There's 
little practical difference between a buggy library and one that raises 
unexpected (i.e. undocumented) exceptions either.


Also note that there are quite a couples cases where the library authors 
themselves cannot predict which exception types may be raised - as soon 
as the library functions expect callback functions, file-like or 
dict-like or whatever-like objects etc, it's the caller's responsability 
to handle the exceptions that may be raised by what *he* passes to the 
library...


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Re: How to parse a string completely into a list

[Bruno Desthuilliers]

[EMAIL PROTECTED] a écrit :

I want to take a long alpha-numeric string with \n and white-space and
place ALL elements of the string (even individual parts of a long
white-space) into separate list elements. The most common way I've
seen this performed is with the split() function, however I don't
believe that it has the power to do what I am looking for.
Any suggestions?


Did you try passing your string to the list() type ?

Python 2.5.1 (r251:54863, Mar  7 2008, 03:41:45)
[GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> s = """I want to take a long alpha-numeric string with \n and 
white-space and

... place ALL elements of the string (even individual parts of a long
... white-space) into separate list elements. The most common way I've
... seen this performed is with the split() function, however I don't
... believe that it has the power to do what I am looking for.
... Any suggestions?
... thanks
... """
>>>
>>> s
"I want to take a long alpha-numeric string with \n and white-space 
and\nplace ALL elements of the string (even individual parts of a 
long\nwhite-space) into separate list elements. The most common way 
I've\nseen this performed is with the split() function, however I 
don't\nbelieve that it has the power to do what I am looking for.\nAny 
suggestions?\nthanks\n"

>>> list(s)
['I', ' ', 'w', 'a', 'n', 't', ' ', 't', 'o', ' ', 't', 'a', 'k', 'e', ' 
', 'a', ' ', 'l', 'o', 'n', 'g', ' ', 'a', 'l', 'p', 'h', 'a', '-', 'n', 
'u', 'm', 'e', 'r', 'i', 'c', ' ', 's', 't', 'r', 'i', 'n', 'g', ' ', 
'w', 'i', 't', 'h', ' ', '\n', ' ', 'a', 'n', 'd', ' ', 'w', 'h', 'i', 
't', 'e', '-', 's', 'p', 'a', 'c', 'e', ' ', 'a', 'n', 'd', '\n', 'p', 
'l', 'a', 'c', 'e', ' ', 'A', 'L', 'L', ' ', 'e', 'l', 'e', 'm', 'e', 
'n', 't', 's', ' ', 'o', 'f', ' ', 't', 'h', 'e', ' ', 's', 't', 'r', 
'i', 'n', 'g', ' ', '(', 'e', 'v', 'e', 'n', ' ', 'i', 'n', 'd', 'i', 
'v', 'i', 'd', 'u', 'a', 'l', ' ', 'p', 'a', 'r', 't', 's', ' ', 'o', 
'f', ' ', 'a', ' ', 'l', 'o', 'n', 'g', '\n', 'w', 'h', 'i', 't', 'e', 
'-', 's', 'p', 'a', 'c', 'e', ')', ' ', 'i', 'n', 't', 'o', ' ', 's', 
'e', 'p', 'a', 'r', 'a', 't', 'e', ' ', 'l', 'i', 's', 't', ' ', 'e', 
'l', 'e', 'm', 'e', 'n', 't', 's', '.', ' ', 'T', 'h', 'e', ' ', 'm', 
'o', 's', 't', ' ', 'c', 'o', 'm', 'm', 'o', 'n', ' ', 'w', 'a', 'y', ' 
', 'I', "'", 'v', 'e', '\n', 's', 'e', 'e', 'n', ' ', 't', 'h', 'i', 
's', ' ', 'p', 'e', 'r', 'f', 'o', 'r', 'm', 'e', 'd', ' ', 'i', 's', ' 
', 'w', 'i', 't', 'h', ' ', 't', 'h', 'e', ' ', 's', 'p', 'l', 'i', 't', 
'(', ')', ' ', 'f', 'u', 'n', 'c', 't', 'i', 'o', 'n', ',', ' ', 'h', 
'o', 'w', 'e', 'v', 'e', 'r', ' ', 'I', ' ', 'd', 'o', 'n', "'", 't', 
'\n', 'b', 'e', 'l', 'i', 'e', 'v', 'e', ' ', 't', 'h', 'a', 't', ' ', 
'i', 't', ' ', 'h', 'a', 's', ' ', 't', 'h', 'e', ' ', 'p', 'o', 'w', 
'e', 'r', ' ', 't', 'o', ' ', 'd', 'o', ' ', 'w', 'h', 'a', 't', ' ', 
'I', ' ', 'a', 'm', ' ', 'l', 'o', 'o', 'k', 'i', 'n', 'g', ' ', 'f', 
'o', 'r', '.', '\n', 'A', 'n', 'y', ' ', 's', 'u', 'g', 'g', 'e', 's', 
't', 'i', 'o', 'n', 's', '?', '\n', 't', 'h', 'a', 'n', 'k', 's', '\n']

>>>


HTH
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Re: Linq to Python

[Duncan Booth]

sturlamolden <[EMAIL PROTECTED]> wrote:

> On Sep 24, 10:59 pm, Duncan Booth <[EMAIL PROTECTED]>
> wrote:
> 
>> Simple LINQ expressions like the one you gave map easily to Python
>> list comprehensions. What Microsoft have done though is provide a
>> consistent implementation which allows you to write complex SQL like
>> expressions whi 
> ch
>> will work identically on databases or most other sequence types.
>> han extensions to syntax.
> 
> List comprehensions work with any iterable sequence. You can nest them
> to make more complex statements. You can also use a generator to
> iterate through a database or an XML document. Here is approximately
> where linq stops being a marvelous addition to Python.
> 
A lot of what LINQ does is already easy to do in Python, and most of the 
rest can probably be added fairly easily, but it does provide a consistent 
framework which may make it easier to do complex LINQ statements than 
complex list comprehensions.

BTW, a minor correction: LINQ statements are closer to generators, not list 
comprehensions. They don't actually evaluate their results until you 
iterate over them and you can re-used the same LINQ statement multiple 
times getting different results if the data has changed.

> And I can honestly do without the SQL syntax.
> 
snap :)

-- 
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Re: Er, one -lime- or two.

[Bruno Desthuilliers]

Aaron "Castironpi" Brady a écrit :

A Python walks into a bar and orders a complex data structure.
Bartender says, "One line or two?"


I don't think that one will have much success in parties !-)
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Re: how to build a MacOS universal python package including external dependencies

[Jaime Huerta Cepas]

Thanks Mathieu,

I think MacPorts will be the easiest way (all dependencies are available).
I could even base the installation script on  "port" commands.
The major problem will be to compile Qt4, which takes hours and requires
X11.

thnks, again.
Jaime.



On Wed, Sep 24, 2008 at 6:44 PM, Mathieu Prevot <[EMAIL PROTECTED]>wrote:

> 2008/9/24 Jaime Huerta Cepas <[EMAIL PROTECTED]>:
> > Hi all,
> >
> > I have developed a set python libraries that provide several scientific
> > methods to analyse and visualize certain type of biological data.  This
> > libraries are based on many external python modules, such as python-mysql
> > python-sip or python-qt4. I use GNU/linux to develop my tools and I found
> no
> > problems into installing all dependencies, however it does not seem to be
> > that easy on MacOS. I am sure that all the dependencies (qt4, pyqt4 ,
> > mysqldb, scipy, numpy) are cross platform, but when you are trying to
> > publish your tool in an academic journal, most referees (many of them
> using
> > MacOS) expect some kind of straightforward installation process for the
> > tool.
> >
> > I wonder if there would be a way in which I could compile all the
> > dependencies and libraries in a MacOs system and then building a static
> > universal binary that I can distribute. I guess  it should be possible,
> but
> > I am not sure how difficult it might be, and whether all dependencies
> (qt4
> > is huge) can be packaged together.
>
> IMHO this is too complex to commit. Macport is a way to do what you
> want, but packages may not be up to date enough. Maybe the easiest and
> simplest way for you to do this is to write a script that will
> download, compile and install everything.
>
> The script should work like:
>
> sudo all_in_one_script.py
>
> and then wait for jobs to be done. Your script will need to know if a
> package was sucessfully installed and then continue or take steps and
> say it. For a complex set of dependencies, I recommend you to write
> Makefiles.
>
> For instance, in pseudo-code:
> if /usr/local/lib/libfoo.dylib doesn't exist
>  download foo
>  install foo
>
> if python-module foo doesn't exist
>  download foo
>  python foo/setup.py install
>
> etc
>
> HTH
> Mathieu
>
>
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Re: python sorting 2dim. array ?

[fredo66]

remark: The server is using python server version 2.3.4
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unable to parse the content using the regular expression

[dudeja . rajat]

 Hello,

I've the following results from Difflib.Compare() which I want to parse them
using the regular expression to find out the the values that have changed.

  ##

  Testing DLL interface

  ##

  Input File:c:\12.txt
  Config File:c:\abc.ini

  ##

  Results:-
  ---

- Analysis Time (Iterations = 1) = 0.0449145s
?   ^^ ^
+ Analysis Time (Iterations = 1) = 0.0447347s
?   ^^ ^

  Width = 0.89

  Height = 0.044

- Length = 10
?   ^
+ Length = 11
?   ^

  End of Results

  ##

  Testing DOTNET interface

  ##
  Input File:c:\12.txt
  Config File:c:\abc.ini

  ###

  Results:-
  ---

- Analysis Time (Iterations = 1) = 0.0449145s
?   ^^ ^
+ Analysis Time (Iterations = 1) = 0.0447347s
?   ^^ ^

  Width = 0.89

  Height = 0.044

- Length = 12
?   ^
+ Length = 13
?   ^

  End of Results



**

How Can I extract the headings out of this file? The headings are:

  ##

  Testing DLL interface

  ##

  Input File:c:\12.txt
  Config File:c:\abc.ini

  ##


< Here I want to display only the values that differ i.e. the lines prceded
with +,?,- signs >


  ##

  Testing DOTNET interface

  ##
  Input File:c:\12.txt
  Config File:c:\abc.ini

  ###


I intent to show only the things that differ with their proper headings(as
above)

Please help me to get the heading stuff out.

Regards,
Rajat
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Re: Connecting to SMB share in python

[Tim Golden]

Ronnie Kwok wrote:

Hello,

I am trying to write a script that copy files from my local machine to a samba
share.



Can't you just mount the share (albeit temporarily) and copy
the files over in the normal way? You haven't said what OS
you're on, but I'm assuming Linux otherwise you'd simply be
talking about a Windows share and copying to a UNC.

TJG
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Re: python sorting 2dim. array ?

[Peter Otten]

[EMAIL PROTECTED] wrote:

> hello,
> Can someone help me with this:
> I have a array like this
> 
>  list[rowindex][colomindex]
> 
> where rows are the records and colom the fields. If I use the .sort()
> method on 'list' the data is sorted on the items of the first colom.
> But I want to sort on the second colom as first (and as second
> sortfield the first colom).
> 
> What is the shortest code for this pls ?
> 
> (all fields are text value, first colom is name, second category)


>>> items = [(1,2), (2,2), (2,1)]
>>> items.sort(lambda x, y: cmp(x[1::-1], y[1::-1]))
>>> items
[(2, 1), (1, 2), (2, 2)]

If you want something more efficient, see

http://www.python.org/doc/faq/programming/#i-want-to-do-a-complicated-sort-can-you-do-a-schwartzian-transform-in-python

Peter
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Re: is decorator the right thing to use?

[Bruno Desthuilliers]

Dmitry S. Makovey a écrit :

Aaron "Castironpi" Brady wrote:
 

It might help to tell us the order of events that you want in your
program.  You're not using 'mymethod' or 'mymethod2', and you probably
want 'return fnew' for the future.  Something dynamic with __getattr__
might work.  Any method call to A, that is an A instance, tries to
look up a method of the same name in the B instance it was initialized
with.


well 'mymethod' and 'mymethod2' were there just to show that A doesn't
function as a pure proxy - it has methods of it's own. See my respnse to
Steve - I proxy messages to more than one aggregated object. going over
them on __getattr__ to look up methods just doesn't seem to be really
efficient to me (I might be wrong though). Decorators seemed to present
good opportunity to simplify the code (well except for the decorator
function itself :) ), make code bit more "fool-proofed" (and give me the
opportunity to test decorators in real life, he-he).

So decorators inside of B just identify that those methods will be proxied
by A. On one hand from logical standpoint it's kind of weird to tell class
that it is going to be proxied by another class,


Indeed - usually, proxied objects shouldn't have to be aware of the 
fact. That doesn't mean your variation on the proxy pattern is 
necessarily bad design (hard to tell without lot of context anyway...), 
but still there's some alarm bell ringing here IMHO - IOW : possibly the 
right thing to do, but needs to be double-checked.



but declaration would be
real close to original function definition which helps to identify where is
it used.

Note that my decorator doesn't change original function - it's a subversion
of decorator to a certain degree as I'm just hooking into python machinery
to add methods to A upon their declaration in B (or so I think).


I wouldn't call this a "subversion" of decorators - it's even a pretty 
common idiom to use decorators to flag some functions/methods for 
special use.


Now I'm not sure I really like your implementation. Here's a possible 
rewrite using a custom descriptor:


class Proxymaker(object):
def __init__(self, attrname):
self.attrname = attrname

def __get__(self, instance, cls):
def _proxied(fn):
fn_name = fn.__name__
def delegate(inst, *args, **kw):
target = getattr(inst, self.attrname)
#return fn(target, *args,**kw)
method = getattr(target, fn_name)
return method(*args, **kw)

delegate.__name__ = "%s_%s_delegate" % \
(self.attrname, fn_name)

setattr(cls, fn_name, delegate)
return fn

return _proxied

class A(object):
def __init__(self,b):
self.val='aval'
self.b=b
b.val='aval'

proxy2b = Proxymaker('b')

def mymethod(self,a):
print "A::mymethod, ",a

def mymethod2(self,a):
print "A::another method, ",a

class B(object):
def __init__(self):
self.val='bval'

@A.proxy2b
def bmethod(self,a):
print "B::bmethod"
print a, self.val

@A.proxy2b
def bmethod2(self,a):
print "B::bmethod2"
print a, self.val


My point is that:
1/ you shouldn't have to rewrite a decorator function - with basically 
the same code - for each possible proxy class / attribute name pair combo
2/ making the decorator an attribute of the proxy class makes 
dependencies clearer (well, IMHO at least).


I'm still a bit uneasy wrt/ high coupling between A and B, and if I was 
to end up with such a design, I'd probably take some times to be sure 
it's really ok.


My  cents...
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Tkinter: Unable to update the text scroll

[dudeja . rajat]

Hi,

I've a Tkinter application which has some widgets and a textbox with
scrollbar, I call it txtScroll.

The txtScroll is used to display the processing log  that application is
doing. Well the problem is that the txtSxroll is not able to display the log
at the time some thing is processed. Rather, it displays the log after the
complete processing processing is done. Example:

In a function, I've the following lines:

def func():
   print 'Testing & Result Comp'
   TASymbols.objLogToGUI.outputText("Starting Test and Results
Comparison\n")
   if selectedLib != TASymbols.strSelectAll:
# we do not pass it as a string instead we will pass it in a
#single element list
libKey = self.__findKey(self.__libDict, selectedLib)

The colored line should display the stuff at the time it appeared in the
code. But only displays this after the function func() has processed
completely.

PS : I'm not using any threading stuff here..


Please help me resolve this problem.


Regards,
Rajat
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Re: Linq to Python

[sturlamolden]

On 25 Sep, 10:08, Duncan Booth <[EMAIL PROTECTED]> wrote:

> A lot of what LINQ does is already easy to do in Python, and most of the
> rest can probably be added fairly easily, but it does provide a consistent
> framework which may make it easier to do complex LINQ statements than
> complex list comprehensions.

Yes, that's the word, "consistent framework". I wonder what that
means? Do you mean Python syntax is inconsitent?


> BTW, a minor correction: LINQ statements are closer to generators, not list
> comprehensions. They don't actually evaluate their results until you
> iterate over them and you can re-used the same LINQ statement multiple
> times getting different results if the data has changed.

Python has generator expressions with the same syntax as list
comprehensions, except you use () instead of [].







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RE: Regex Help

[Lawrence D'Oliveiro]

In message <[EMAIL PROTECTED]>, Support
Desk wrote:

> Thanks for the reply ...

A: The vulture doesn't get Frequent Poster miles.
Q: What's the difference between a top-poster and a vulture?
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Re: The Python computer language

[sturlamolden]

On 25 Sep, 06:02, ROSEEE <[EMAIL PROTECTED]> wrote:
> http://pythoncomputer.blogspot.com

I wonder where the usenet cancelbots have gone?
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Re: Comparing float and decimal

[Mark Dickinson]

On Sep 24, 6:18 pm, Terry Reedy <[EMAIL PROTECTED]> wrote:
> If there is not now, there could be in the future, and the decimal
> authors are committed to follow the standard wherever it goes.
> Therefore, the safe course, to avoid possible future deprecations due to
> doing too much, is to only do what is mandated.

Makes sense.  It looks as though the standard's pretty stable now
though;  I'd be quite surprised to see it evolve to include discussion
of floats.  But then again, people thought it was stable just before
all the extra transcendental operations appeared. :-)

> For integral values, this is no problem.
>  >>> hash(1) == hash(1.0) == hash(decimal.Decimal(1)) ==
> hash(fractions.Fraction(1)) == 1
> True

Getting integers and Decimals to hash equal was actually
something of a pain, and required changing the way that
the hash of a long was computed.  The problem in a nutshell:
what's the hash of Decimal('1e1')?  The number is
clearly an integer, so its hash should be the same as that
of 10**1.  But computing 10**1, and then
finding its hash, is terribly slow...   (Try
hash(Decimal('1e1')) in Python 2.5 and see
what happens!  It's fixed in Python 2.6.)

As more numeric types get added to Python, this
'equal implies equal hash' requirement becomes more
and more untenable, and difficult to maintain. I also find
it a rather unnatural requirement:  numeric equality
is, to me, a weaker equivalence relation than the one
that should be used for identifying keys in dictionaries,
elements of sets, etc.  Fraction(1, 2) and 0.5 should, to my
eyes, be considered
different elements of a set. But the only way to 'fix' this
would be to have Python recognise two different types of
equality, and then it wouldn't be Python any more.

The SAGE folks also discovered that they couldn't
maintain the hash requirement.

> Decimals can also be converted to floats (they also have a  __float__
> method).  But unlike fractions, the conversion must be explicit, using
> float(decimal), instead of implicit, as with ints and fractions.

Maybe:  if I *had* to pick a direction, I'd make float + Decimal
produce a Decimal, on the basis that Decimal is arbitrary precision
and that the float->Decimal conversion can be made losslessly.
But then there are a whole host of decisions one has to make
about rounding, significant zeros, ...  (And then, as you point
out, Cowlishaw might come out with a new version of the standard
that does include interactions with floats, and makes an entirely
different set of decisions...)

Mark
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Re: translating ascii to binary

[Lie]

On Sep 17, 11:34 pm, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
> Lie wrote:
> >> Any advice about this matter would be very appreciated.
> >> Thanks in advance.
>
> > It'd be easier to make a one-char version of ascii2bin then make the
> > string version based on the one-char version.
>
> And it'd be a lot easier to read your posts if you trimmed away at least
> some of the original message before posting.  If you cannot do that for
> some technical reason, I recommend using top-posting instead.
>
> 


Ah.. yes, sorry for that, I had never thought about that since I use
Google Groups, which automatically trim long quotes, to access the
list.
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Re: Linq to Python

[hrishy]

Hi

If i rephrase my question how will i do this in Python

http://informationr.net/ir/13-2/TB0806.html

Watch this query on the page Where he joins all different kind of things with 
ease and elegance(as per my opinion)

[code]
var stoogeGuys = 
 Beginning with the XML source
 from xmlGuys in xmlSource.Descendants("Stooge")
 Join to the array on the common element "stoogeName"
 join arrayGuys in familyFacts 
   on xmlGuys.Element("stoogeName").Value equals arrayGuys.stoogeName
 Join to the database on the common element "stoogeName"
 join dbGuys in stoogeContext.stoogeTables 
   on xmlGuys.Element("stoogeName").Value equals dbGuys.stoogeName 
 select new
 {
firstName= dbGuys.stoogeName,
familyName   = arrayGuys.familyName,
birthDate= xmlGuys.Element("birthDate").Value,
deathDate= xmlGuys.Element("deathDate").Value,
hairCutStyle = dbGuys.stoogeHaircut,
 };
[/code]

regards
Hrishy


  
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Re: Comparing float and decimal

[Mark Dickinson]

On Sep 25, 8:55 am, Tim Roberts <[EMAIL PROTECTED]> wrote:
> Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote:
> >0.1 actually is
>
> >In [98]: '%.50f' % 0.1
> >Out[98]: '0.1555111512312578270211815834045410'
> >?
>
> Actually, it's not.  Your C run-time library is generating random digits
> after it runs out of useful information (which is the first 16 or 17
> digits).  0.1 in an IEEE 784 double is this:
>
>      0.100088817841970012523233890533447265625

I get (using Python 2.6):

>>> n, d = 0.1.as_integer_ratio()
>>> from decimal import Decimal, getcontext
>>> getcontext().prec = 100
>>> Decimal(n)/Decimal(d)
Decimal('0.155511151231257827021181583404541015625')

which is a lot closer to Marc's answer.  Looks like your float
approximation to 0.1 is 6 ulps out.  :-)

Mark
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[OT] Looking for developers: platform for fast and effective learning

[Adam Dziendziel]

Hello everybody,

I'm working on a website for fast and effective learning using spaced
repetition technique.
This is the same method used in SuperMemo, Mnemosyne, FullRecall or
Anki software.
I'd want to create an online version, supporting easy adding of own
material and sharing with others. The method is very effective and is
great for learning foreign language, learning to exams etc. I wonder
that there is no such site running already. There is SuperMemo.net,
but it is a typical commercial application, oriented for selling
commercial courses. I would like to put on building community,
collaboration in writing material and social learning.

I'm looking for ambitious people, who want to take part in this
undertaking. I can offer revenue share, if the project succeed.

Technologies: Python (Pylons) + JavaScript (Ext JS)
I have a working base in Pylons and Ext JS but we can consider
changing tools.

Best regards,
Adam Dziendziel
adam (dot) dziendziel (at) gmail (dot) com
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Re: Linq to Python

[hrishy]

Hi Grant

haha :-) i discounted that perspective :-)

regards
Hrishy


--- On Thu, 25/9/08, Grant Edwards <[EMAIL PROTECTED]> wrote:

> From: Grant Edwards <[EMAIL PROTECTED]>
> Subject: Re: Linq to Python
> To: python-list@python.org
> Date: Thursday, 25 September, 2008, 2:22 AM
> On 2008-09-24, Bruno Desthuilliers
> <[EMAIL PROTECTED]> wrote:
> > hrishy a écrit :
> > (snip)
> >
> >
> >> I apologise
> >> (I thought Python programmers were smart and they
> did know what LINQ was)
> >
> > Is there really any relation between "being
> smart" and knowing anything 
> > about the latest MS fad ?
> 
> God, I hope not -- or I'd rather be stupid.
> 
> -- 
> Grant
> 
> --
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Re: Connecting to SMB share in python

[Ronnie Kwok]

Thank you for the reply!

Yes, I am running the script under linux and it will be doing some 
processing before copying it over to the samba mount.


It's totally fine to mount it with os.sys(...) approach but I am just 
thinking if there's other option.


ronnie


On 2008-09-25 16:36:35 +0800, Tim Golden <[EMAIL PROTECTED]> said:


Ronnie Kwok wrote:

Hello,

I am trying to write a script that copy files from my local machine to a samba
share.



Can't you just mount the share (albeit temporarily) and copy
the files over in the normal way? You haven't said what OS
you're on, but I'm assuming Linux otherwise you'd simply be
talking about a Windows share and copying to a UNC.

TJG



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Re: Linq to Python

[hrishy]

Hi Roger

I am impressed (i always suspected Python programmers are smart no doubt about 
it).

But what about the case where they join different sources like the one here

http://informationr.net/ir/13-2/TB0806.html

Thanks for teaching me :-) i am thankful for that

regards
Hrishy




> 
> names = ["Burke", "Connor",
> "Frank", "Everett",
>  "Albert", "George",
> "Harris", "David"]
> 
> result = [each.upper() for each in names if len(each) == 5]
> 
> result.sort()
> 
> for each in result: print each
> 
> 
> Yes clearly 'the Python crowd' must admit LINQ is
> 'much better', I'm
> sold, in fact off to download my "Free, but limited
> editions of Visual
> Studio 2005 for a single programming language supported by
> .NET" right away!
> 
> OK so maybe I'm being naive here but it looks to me
> like this new
> paradigm's big idea is to use a python + SQL type
> syntax to access data
> in random objects. Big whoop. It's not that difficult
> to write a
> generators that wraps XML files and databases is it?
> 
> What am I missing here?
> 
> 
> Roger Heathcote.
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Re: python sorting 2dim. array ?

[bearophileHUGS]

[EMAIL PROTECTED]:
> list[rowindex][colomindex]
> I want to sort on the second colom as first (and as
> second sortfield the first colom).

A good way, in Python 2.5:

>>> from operator import itemgetter
>>> a = [[1, 2], [3, 1], [2, 5], [7, 1]]
>>> a.sort(key=itemgetter(1, 0))
>>> a
[[3, 1], [7, 1], [1, 2], [2, 5]]

Bye,
bearophile
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Re: Connecting to SMB share in python

[Diez B. Roggisch]

Ronnie Kwok wrote:

> Thank you for the reply!
> 
> Yes, I am running the script under linux and it will be doing some
> processing before copying it over to the samba mount.
> 
> It's totally fine to mount it with os.sys(...) approach but I am just
> thinking if there's other option.

None that is any more comfortable. If anything, you'd need smbclient or some
such to list and fetch data - which is *much* more complicated that simply
mounting a share defined in fstab.

Diez
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Re: Comparing float and decimal

[Nick Craig-Wood]

Tim Roberts <[EMAIL PROTECTED]> wrote:
>  Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote:
> >
> >On Tue, 23 Sep 2008 07:08:07 -0700, Michael Palmer wrote:
> >
> >>> > This seems to break the rule that if A is equal to B and B is equal
> >>> > to C then A is equal to C.
> >>>
> >>> I don't see why transitivity should apply to Python objects in general.
> >> 
> >> Well, for numbers it surely would be a nice touch, wouldn't it. May be
> >> the reason for Decimal to accept float arguments is that irrational
> >> numbers or very long rational numbers cannot be converted to a Decimal
> >> without rounding error, and Decimal doesn't want any part of it. Seems
> >> pointless to me, though.
> >
> >Is 0.1 a very long number?  Would you expect ``0.1 == Decimal('0.1')`` to 
> >be `True` or `False` given that 0.1 actually is
> >
> >In [98]: '%.50f' % 0.1
> >Out[98]: '0.1555111512312578270211815834045410'
> >?
> 
>  Actually, it's not.  Your C run-time library is generating random digits
>  after it runs out of useful information (which is the first 16 or 17
>  digits).  0.1 in an IEEE 784 double is this:
> 
>   0.100088817841970012523233890533447265625

Not according to the decimal FAQ

http://docs.python.org/lib/decimal-faq.html


import math
from decimal import *

def floatToDecimal(f):
"Convert a floating point number to a Decimal with no loss of information"
# Transform (exactly) a float to a mantissa (0.5 <= abs(m) < 1.0) and an
# exponent.  Double the mantissa until it is an integer.  Use the integer
# mantissa and exponent to compute an equivalent Decimal.  If this cannot
# be done exactly, then retry with more precision.

mantissa, exponent = math.frexp(f)
while mantissa != int(mantissa):
mantissa *= 2.0
exponent -= 1
mantissa = int(mantissa)

oldcontext = getcontext()
setcontext(Context(traps=[Inexact]))
try:
while True:
try:
   return mantissa * Decimal(2) ** exponent
except Inexact:
getcontext().prec += 1
finally:
setcontext(oldcontext)

print "float(0.1) is", floatToDecimal(0.1)


Prints this

float(0.1) is 0.155511151231257827021181583404541015625

On my platform

Python 2.5.2 (r252:60911, Aug  8 2008, 09:22:44),
[GCC 4.3.1] on linux2
Linux 2.6.26-1-686
Intel(R) Core(TM)2 CPU T7200

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Re: Linq to Python

[sturlamolden]

On 25 Sep, 12:06, hrishy <[EMAIL PROTECTED]> wrote:

> var stoogeGuys =
>      Beginning with the XML source
>      from xmlGuys in xmlSource.Descendants("Stooge")
>      Join to the array on the common element "stoogeName"
>      join arrayGuys in familyFacts
>            on xmlGuys.Element("stoogeName").Value equals arrayGuys.stoogeName
>      Join to the database on the common element "stoogeName"
>      join dbGuys in stoogeContext.stoogeTables
>            on xmlGuys.Element("stoogeName").Value equals dbGuys.stoogeName
>      select new
>      {
>         firstName    = dbGuys.stoogeName,
>         familyName   = arrayGuys.familyName,
>         birthDate    = xmlGuys.Element("birthDate").Value,
>         deathDate    = xmlGuys.Element("deathDate").Value,
>         hairCutStyle = dbGuys.stoogeHaircut,
>      };
> [/code]


That is a for loop over xmlGuys in xmlSource.Descendants("Stooge").
Those joins are e.g. dictionary lookups, and finally an object with
names, birthdates, etc. are appended to the list stoogeGuys.






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How to get the filename in the right case ?

[Stef Mientki]

hello,

How can I find the correct case of a filename ?

Background in my program I use case sensitive filenames, just like 
Python requires.

Now I've integrated pdb into the program,
but pdb acts somwhat strange:
upon a breakpoint it gives the filename always in lowercase (probably 
this only happens on windows).


So is there a way to get the correct case of a given filename in lowercase ?

One solution might be to make the comparison in my program always with 
lowercase,

but then I'm sure the program won't work on non-windows systems.

btw, why does pdb behave that way ( Python 2.5 ) ?

thanks,
Stef Mientki
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Re: Linq to Python

[hrishy]

Hi Tim

I am not a LINQ expert just a LINQ user and (was a little envious why the 
langauge i fantasize doesnt have it (pardon my ignorance of python))

LINQ as far as i know allows you to query all sources using a consistent 
interface .

You can query a message queue ,xml document ,array object or relational source 
by learning LINQ and even join them as illustrated below

http://informationr.net/ir/13-2/TB0806.html

If somebody can tutor me how i can do that in python that would be great (and 
mayeb satisfy my greed and leave me with a happy feeling that my langauge 
python can do it)

regards
Hrishy


--- On Wed, 24/9/08, Tim Golden <[EMAIL PROTECTED]> wrote:

> From: Tim Golden <[EMAIL PROTECTED]>
> Subject: Re: Linq to Python
> To: 
> Cc: python-list@python.org
> Date: Wednesday, 24 September, 2008, 8:20 PM
> [EMAIL PROTECTED] wrote:
> > sturlamolden:
> >> No, because Python already has list comprehensions
> and we don't need the XML buzzword.<
> > 
> > LINQ is more than buzzwords. Python misses several of
> those features.
> > So maybe for once the Python crowd may recognize such
> C# feature as
> > much better than things present in Python.
> > Said that, I presume Python will go on as usual, and
> LINQ-like
> > capabilities will not be integrated in Python. In the
> meantime where I
> > live lot of people will keep using C# instead of
> Python and CLisp,
> > natural selection at work indeed.
> 
> Perhaps a quick summary of what LINQ offers which might
> "be integrated into Python" would help those of
> us who
> are ignorant? (This is a serious comment; I'd like to
> know).
> 
> TJG
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Question about reading a xml

[xiaowei.lin]

Hi all,

I am working on SunOS 5.8,  Python 2.2.2

When I run the python grogram below:

 

#Beginning

import xml.dom.minidom

 

xml_str = """\



' this is a

c' this is b

this is c



"""

 

dom = xml.dom.minidom.parseString(xml_str)

 

na = dom.getElementsByTagName("a")[0]

nb = dom.getElementsByTagName("b")[0]

nc = dom.getElementsByTagName("c")[0]

 

print na.childNodes[0].data

print nb.childNodes[0].data

print nc.childNodes[0].data

#End

 

The result is as below:

" this is a

c

this is c

 

I don't know why the letters following the quote are lost.
Even the quote lost if the quote following another letter.

 

Regards,

Sean

 



This message is for the designated recipient only and may contain privileged, 
proprietary, or otherwise private information.  If you have received it in 
error, please notify the sender immediately and delete the original.  Any other 
use of the email by you is prohibited.
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Re: How to get the filename in the right case ?

[Diez B. Roggisch]

Stef Mientki wrote:

> hello,
> 
> How can I find the correct case of a filename ?
> 
> Background in my program I use case sensitive filenames, just like
> Python requires.
> Now I've integrated pdb into the program,
> but pdb acts somwhat strange:
> upon a breakpoint it gives the filename always in lowercase (probably
> this only happens on windows).
> 
> So is there a way to get the correct case of a given filename in lowercase
> ?
> 
> One solution might be to make the comparison in my program always with
> lowercase,
> but then I'm sure the program won't work on non-windows systems.
> 
> btw, why does pdb behave that way ( Python 2.5 ) ?

I doubt it does. It sure doesn't on unix, and I fail to see any reason why
it should do that on windows - given that the total number of lower() in
pdb.py amounts to one, and that's used to process user-input such
as "Yes", "y", "YES" or whatnot.

 Are you sure you are not processing the content through some lower()-call
when embedding pdb? 

Diez
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Re: Linq to Python

[sturlamolden]

On 25 Sep, 12:06, hrishy <[EMAIL PROTECTED]> wrote:

> [code]
> var stoogeGuys =
>      Beginning with the XML source
>      from xmlGuys in xmlSource.Descendants("Stooge")
>      Join to the array on the common element "stoogeName"
>      join arrayGuys in familyFacts
>            on xmlGuys.Element("stoogeName").Value equals arrayGuys.stoogeName
>      Join to the database on the common element "stoogeName"
>      join dbGuys in stoogeContext.stoogeTables
>            on xmlGuys.Element("stoogeName").Value equals dbGuys.stoogeName
>      select new
>      {
>         firstName    = dbGuys.stoogeName,
>         familyName   = arrayGuys.familyName,
>         birthDate    = xmlGuys.Element("birthDate").Value,
>         deathDate    = xmlGuys.Element("deathDate").Value,
>         hairCutStyle = dbGuys.stoogeHaircut,
>      };
> [/code]

It could e.g. look like this in Python:

stoogeGuys = []
for xmlGuys in xmlSource.Descendants["Stooge"]:
arrayGuys = familyFacts[xmlGuys.stoogeName]
dbGuys = stoogeContext.stoogeTables[xmlGuys.stoogeName]
stoogeGuys += \
   [{'firstName':dbGuys.stoogeName,
 'familyName':   arrayGuys.familyName,
 'birthDate':xmlGuys.birthDate,
 'deathDate':dbGuys.deathDate,
 'hairCutStyle': dbGuys.stoogeHaircut}]

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Re: Comparing float and decimal

[Mark Dickinson]

On Sep 23, 1:58 pm, Robert Lehmann <[EMAIL PROTECTED]> wrote:
> I don't see why transitivity should apply to Python objects in general.

Hmmm.  Lack of transitivity does produce some, um, interesting
results when playing with sets and dicts.  Here are sets s and
t such that the unions s | t and t | s have different sizes:

>>> from decimal import Decimal
>>> s = set([Decimal(2), 2.0])
>>> t = set([2])
>>> len(s | t)
2
>>> len(t | s)
1

This opens up some wonderful possibilities for hard-to-find bugs...

Mark
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Re: Linq to Python

[hrishy]

Hi

Pardon my ignorance again but id ont see any join in python or did i miss 
something ?

regards
Hrishy


--- On Thu, 25/9/08, sturlamolden <[EMAIL PROTECTED]> wrote:

> From: sturlamolden <[EMAIL PROTECTED]>
> Subject: Re: Linq to Python
> To: python-list@python.org
> Date: Thursday, 25 September, 2008, 12:02 PM
> On 25 Sep, 12:06, hrishy <[EMAIL PROTECTED]> wrote:
> 
> > [code]
> > var stoogeGuys =
> >      Beginning with the XML source
> >      from xmlGuys in
> xmlSource.Descendants("Stooge")
> >      Join to the array on the common element
> "stoogeName"
> >      join arrayGuys in familyFacts
> >            on
> xmlGuys.Element("stoogeName").Value equals
> arrayGuys.stoogeName
> >      Join to the database on the common element
> "stoogeName"
> >      join dbGuys in stoogeContext.stoogeTables
> >            on
> xmlGuys.Element("stoogeName").Value equals
> dbGuys.stoogeName
> >      select new
> >      {
> >         firstName    = dbGuys.stoogeName,
> >         familyName   = arrayGuys.familyName,
> >         birthDate    =
> xmlGuys.Element("birthDate").Value,
> >         deathDate    =
> xmlGuys.Element("deathDate").Value,
> >         hairCutStyle = dbGuys.stoogeHaircut,
> >      };
> > [/code]
> 
> It could e.g. look like this in Python:
> 
> stoogeGuys = []
> for xmlGuys in xmlSource.Descendants["Stooge"]:
> arrayGuys = familyFacts[xmlGuys.stoogeName]
> dbGuys = stoogeContext.stoogeTables[xmlGuys.stoogeName]
> stoogeGuys += \
>[{'firstName':dbGuys.stoogeName,
>  'familyName':   arrayGuys.familyName,
>  'birthDate':xmlGuys.birthDate,
>  'deathDate':dbGuys.deathDate,
>  'hairCutStyle': dbGuys.stoogeHaircut}]
> 
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Re: Linq to Python

[sturlamolden]

On 25 Sep, 13:08, hrishy <[EMAIL PROTECTED]> wrote:

> Pardon my ignorance again but id ont see any join in python or did i miss 
> something ?

It's more Pythonic to use the syntax of dictionary lookups.
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Re: Linq to Python

[hrishy]

Hi

Thank you very much I appreciate taking the pain to explain this to me.

regards
Hrishy


--- On Thu, 25/9/08, sturlamolden <[EMAIL PROTECTED]> wrote:

> From: sturlamolden <[EMAIL PROTECTED]>
> Subject: Re: Linq to Python
> To: python-list@python.org
> Date: Thursday, 25 September, 2008, 12:16 PM
> On 25 Sep, 13:08, hrishy <[EMAIL PROTECTED]> wrote:
> 
> > Pardon my ignorance again but id ont see any join in
> python or did i miss something ?
> 
> It's more Pythonic to use the syntax of dictionary
> lookups.
> --
> http://mail.python.org/mailman/listinfo/python-list


  
--
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Spring Python 0.7.0 is released

[Goldfish]

Release 0.7.0 was completed last night, and released to
sourceforge.net.

NOTE: This release included a lot of API scrubbing, in order to bring
things more in tune with PEP-0008 (python's style guide). You're
existing apps PROBABLY were impacted, if you used any of Spring
Python's utility classes. Since we are pre-1.0, this is the best time
for such a cleanup. When 1.0 hits the streets, we won't make such a
sweeping change without extensive backwards support.

See [url]http://springpython.webfactional.com[/url] for more
information.

Visit our community forum at [url]http://forum.springframework.org/
forumdisplay.php?f=45[/url] for current threads of discussion.

--Greg Turnquist, Spring Python project lead
=
Release Notes - Spring Python - Version 0.7


** Bug
* [SESPRINGPYTHONPY-63] - Running setup.py returns an exception

** Improvement
* [SESPRINGPYTHONPY-49] - Upgrade PetClinic to CherryPy 3.1
* [SESPRINGPYTHONPY-64] - Adding a schema for the regular
component elements
* [SESPRINGPYTHONPY-69] - Remove deprecated connection factories
from baseline
* [SESPRINGPYTHONPY-70] - Scrub function/attribute naming
conventions to more closely follow PEP-0008.

** New Feature
* [SESPRINGPYTHONPY-61] - Generate reference documentation for the
project

** Refactoring
* [SESPRINGPYTHONPY-65] - Change 'type' attribute in XML
application config to 'scope' to be in line with the lifetime concept
in other Spring platforms


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Re: Folder Actions on Mac OSX Leopard?

[has]

On 25 Sep, 00:30, Sean DiZazzo <[EMAIL PROTECTED]> wrote:

> I always wondered about Folder Actions...  I just tested.  You can
> have applescript call python scripts via `do shell script`.  But it
> seemed a bit flakey.

Should work in theory. For which values of flakey? e.g. Is it a
technical problem with Folder Actions, AppleScript, 'do shell script,
and/or Python, or just your AppleScript code that needs some work
(e.g. there are some common gotchas with using 'do shell script' that
often trip up AppleScript newcomers).

FWIW, I would second the suggestion to look into FSEvents as a
possible alternative to Folder Actions. There's also kqueue which is
lower level but may have/have had Python bindings already written for
it.

Alternatively, if the OP really wants to use FAs, there are a couple
of other options for that:

1. I've got a simple py2app-based application shell and an AppleScript
that automatically forwards FA events to that application - just
insert your Python code into the application shell and build it,
attach the AppleScript to some folders, and you're good to go. Email
me directly if you want a copy.

2. If you're brave, you could try using the PyOSA component on the
appscript website, which allows you to write OSA scripts in Python.
FAs will work with any kind of OSA script (.scpt files), not just
AppleScript ones. PyOSA is officially discontinued due to some
intractable limitations in its/CPython's design (specifically the
inability of an in-process Python interpreter to sandbox unrelated
scripts so that they can't interfere with each others' modules, file
handles, etc). However, it's reasonably functional and should be
usable for FAs with a little care.


HTH

has
--
Control AppleScriptable applications from Python, Ruby and ObjC:
http://appscript.sourceforge.net

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Re: How to get the filename in the right case ?

[Stef Mientki]

Diez B. Roggisch wrote:

Stef Mientki wrote:

  

hello,

How can I find the correct case of a filename ?

Background in my program I use case sensitive filenames, just like
Python requires.
Now I've integrated pdb into the program,
but pdb acts somwhat strange:
upon a breakpoint it gives the filename always in lowercase (probably
this only happens on windows).

So is there a way to get the correct case of a given filename in lowercase
?

One solution might be to make the comparison in my program always with
lowercase,
but then I'm sure the program won't work on non-windows systems.

btw, why does pdb behave that way ( Python 2.5 ) ?



I doubt it does. It sure doesn't on unix, and I fail to see any reason why
it should do that on windows - given that the total number of lower() in
pdb.py amounts to one, and that's used to process user-input such
as "Yes", "y", "YES" or whatnot.

  

Yes I'm pretty sure, two reasons:
1. when I perform a step_into, jumping into a file that doesn't have 
breakpoints itself (meaning my program doesn't even know of this file),

pdb returns a lowercase filename
2. rpdb2 (probably based or even inherited from pdb) has the same 
behavior. Asking the writer of rpdb2, I got some excuse (which I didn't 
understand) why he had done it that way.



 Are you sure you are not processing the content through some lower()-call
when embedding pdb? 

  

But maybe pdb does ?

thanks anyway,
Stef
  
Diez

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Re: multiple processes with private working dirs

[Tim Arnold]

On Sep 25, 12:11 am, alex23 <[EMAIL PROTECTED]> wrote:
> On Sep 25, 3:37 am, "Tim Arnold" <[EMAIL PROTECTED]> wrote:
>
> > Am I missing something?
>
> Do you mean something other than the replies you got the last time you
> asked the exact same question?
>
> http://groups.google.com/group/comp.lang.python/browse_frm/thread/42c...

arggg. My newreader didn't show the initial post so I thought it never
made it through.
sorry for the noise.
--Tim Arnold
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Re: multiple processes with private working dirs

[sturlamolden]

On 24 Sep, 19:37, "Tim Arnold" <[EMAIL PROTECTED]> wrote:

> Am I missing something? Is there a better way?

Use the pyprocessing module (to appear as standard module
multiprocessing in Python 2.6). It has almost the same interface as
Python's threading and Queue standard modules, except you are working
with processes not threads. To wait for a process to finish, just join
it like you would do with a thread.


http://pyprocessing.berlios.de/





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Re: Connecting to SMB share in python

[Tim Golden]

Ronnie Kwok wrote:
Yes, I am running the script under linux and it will be doing some 
processing before copying it over to the samba mount.


It's totally fine to mount it with os.sys(...) approach but I am just 
thinking if there's other option.



I'm not really a Linux person but from all I can see
from Googling around a bit, the os.system ("mount/unmount")
option is still the most viable. Hopefully someone with
real expertise can chip in.

BTW, opinion in this ng/mailing list tends to favour
bottom-posting or interleaved posting.

TJG
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Re: How to get the filename in the right case ?

[Diez B. Roggisch]

> Yes I'm pretty sure, two reasons:
> 1. when I perform a step_into, jumping into a file that doesn't have
> breakpoints itself (meaning my program doesn't even know of this file),
> pdb returns a lowercase filename

What has that to do with potential output postprocessing? 



> 2. rpdb2 (probably based or even inherited from pdb) has the same
> behavior. Asking the writer of rpdb2, I got some excuse (which I didn't
> understand) why he had done it that way.

rpdb2 is not pdb.

Below is the output of a Pdb-session I just had:


(eggbasket)[EMAIL PROTECTED]:~/software/vc/EggBasket$ nosetests -s
eggbasket.tests.test_model
2008-09-25 14:13:10,374 turbogears.identity.saprovider INFO Loading:
eggbasket.model.VisitIdentity
.> 
/home/dir/software/vc/EggBasket/eggbasket/tests/test_model.py(59)test_versionsets()
-> vi1 = vset.add_pkg_info(p1)
(Pdb) n
> /home/dir/software/vc/EggBasket/eggbasket/tests/test_model.py(60)test_versionsets()
-> session.flush()
(Pdb) n


As you can see - mixed-case filenames. Linux though.

There is a *very* simple way for you to check: just create a file called

FooBar.py

and inside that, put

import pdb; pdb.set_trace()
print "hello"


Run that on the windows shell. See if that puts out all lowercase or not. I
can't do that right now as my VBox Windows won't start.

Then we know if PDB is really the culprit.

Apart from that, is that really a problem that the filenames are all lower
case? AFAIK Windows is case-insensitive regarding filenames anyway. So
opening the file by just passing the filename should work seamless.

Diez
--
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Re: Linq to Python

[Duncan Booth]

sturlamolden <[EMAIL PROTECTED]> wrote:

> On 25 Sep, 10:08, Duncan Booth <[EMAIL PROTECTED]> wrote:
> 
>> A lot of what LINQ does is already easy to do in Python, and most of
>> the rest can probably be added fairly easily, but it does provide a
>> consistent framework which may make it easier to do complex LINQ
>> statements than complex list comprehensions.
> 
> Yes, that's the word, "consistent framework". I wonder what that
> means? Do you mean Python syntax is inconsitent?

No Python's syntax is fine. The api's aren't as consistent though: 
Microsoft added a common set of extension methods which work on 
databases, xml, builtin sequences and can be easily extended to include 
other custom sequences.

As an example to filter a list in Python you'd use a list comprehension 
with an 'if', but for a database you'd probably prefer a select with a 
'where' clause so as to avoid retrieving and discarding 99 or your 1 
million rows. The apis defined by LINQ allow that sort of optimisation 
to happen transparently, the simple list would just test each element 
but the database would run an appropriate query.

So what the 'can we have LINQ in Python' people are asking is to be able 
to write things like:

   x = (c for c in customers if c.id=='123')

and know that they aren't doing a linear search unless that is the best 
that can be done. The LINQ equivalent would be something like:

  var x = from c in customers where c.id=='123'
  select new { c.name, c.id };

which is compiled to:

  var x = customers.Where(c => c.id=='123');

and depending on the type of 'customers' the Where method can either get 
a callable function to test the condition or an expression tree which it 
can compile into another language such as SQL (C# lambdas can compile 
either to executable code or to Expression<> objects that you can 
further process).

There's an article at 
http://www.interact-sw.co.uk/iangblog/2005/09/30/expressiontrees which 
has a real example showing how:

DataContext db = new DataContext("server=.;initial catalog=northwind");
Table orders = db.GetTable();
Table customers = db.GetTable();

var q = from o in orders, c in customers
where o.ShipCity == "London" && (o.CustomerID == c.CustomerID)
select new { o.OrderDate, c.CompanyName, c.ContactTitle,
 c.ContactName };

actually ends up as a single SQL query:

exec sp_executesql N'SELECT [t1].[CompanyName], [t1].[ContactName], 
[t1].[ContactTitle], [t0].[OrderDate]
FROM [Orders] AS [t0], [Customers] AS [t1]
WHERE ([t0].[ShipCity] = @p0) AND ([t0].[CustomerID] = [t1].
[CustomerID])', N'@p0 nvarchar(6)', @p0 = N'London' 


>> BTW, a minor correction: LINQ statements are closer to generators,
>> not list comprehensions. They don't actually evaluate their results
>> until you iterate over them and you can re-used the same LINQ
>> statement multiple times getting different results if the data has
>> changed. 
> 
> Python has generator expressions with the same syntax as list
> comprehensions, except you use () instead of [].
> 
It might surprise you to know that I have actually come across generator 
expressions. :^)

My wording was deliberate: LINQ queries are re-usable, so are Python's 
generators, but generator expressions are not. The comparison isn't 
exact, you have to call the generator to get an iterator whereas a LINQ 
expression gives you something which is directly iterable.

-- 
Duncan Booth http://kupuguy.blogspot.com
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Re: Linq to Python

[sturlamolden]

On 25 Sep, 14:22, Duncan Booth <[EMAIL PROTECTED]> wrote:

> No Python's syntax is fine. The api's aren't as consistent though:
> Microsoft added a common set of extension methods which work on
> databases, xml, builtin sequences and can be easily extended to include
> other custom sequences.

That is correct, but it is a library issue and cannot be solved by
adding new syntax.


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multiprocessing eats memory

[Max Ivanov]

I'm playing with pyprocessing module and found that it eats lot's of
memory. I've made small test case to show it. I pass ~45mb of data to
worker processes and than get it back slightly modified. At any time
in main process there are shouldn't be no more than two copies of data
(one original data and one result). I run it on 8-core server and top
shows me that main process eats ~220 Mb and worker processes eats 90
-150 mb. Isn't it too much?

Small test-case is uploaded to pastebin: http://pastebin.ca/1210523
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what does "python -i" use as input stream (stdin)?

[Almar Klein]

Hi,
I want to start "python -i" from a subprocess and change its stdin stream,
so I get control over the commands I feed the interpreter.

I thought just changing sys.stdin to my custom file-like object would
suffice, but this does not work. Neither does changing sys.__stdin__.

I guess the interpreter got a reference to the original stdin (the Pipe)
before
I could change it, and is using that instead of sys.stdin.

Any thoughts how I can get the interpreter to use MY custom stream?

thanks,
Almar
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Re: Linq to Python

[bearophileHUGS]

Duncan Booth:
> Microsoft added a common set of extension methods which work on
> databases, xml, builtin sequences and can be easily extended to include
> other custom sequences.

When the processing is done in memory, LINQ may also work well with
multi-core CPUs, see PLINQ.

Bye,
bearophile
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Re: urllib error on urlopen

[Mike Driscoll]

On Sep 24, 7:08 pm, Michael Palmer <[EMAIL PROTECTED]> wrote:
> On Sep 24, 11:46 am, Mike Driscoll <[EMAIL PROTECTED]> wrote:
>
>
>
> > Hi,
>
> > I have been using the following code for over a year in one of my
> > programs:
>
> > f = urllib2.urlopen('https://www.companywebsite.com/somestring')
>
> > It worked great until the middle of the afternoon yesterday. Now I get
> > the following traceback:
>
> > Traceback (most recent call last):
> >   File "", line 1, in 
> >     response = urllib2.urlopen(req).read().strip()
> >   File "c:\python25\lib\urllib2.py", line 124, in urlopen
> >     return _opener.open(url, data)
> >   File "c:\python25\lib\urllib2.py", line 381, in open
> >     response = self._open(req, data)
> >   File "c:\python25\lib\urllib2.py", line 399, in _open
> >     '_open', req)
> >   File "c:\python25\lib\urllib2.py", line 360, in _call_chain
> >     result = func(*args)
> >   File "c:\python25\lib\urllib2.py", line 1115, in https_open
> >     return self.do_open(httplib.HTTPSConnection, req)
> >   File "c:\python25\lib\urllib2.py", line 1082, in do_open
> >     raise URLError(err)
> > URLError:  > routines:SSL23_GET_SERVER_HELLO:unknown protocol')>
>
> > I tried my Google Fu on this error, but there's not much out there. I
> > tried using a proxy in Python, but that returned the same traceback.
> > If I copy the URL into my browser, it resolves correctly. Does anyone
> > have any advice on how to troubleshoot this error?
>
> > I am using Python 2.5.2 on Windows XP.
>
> > Thanks,
>
> > Mike
>
> Could it just be a misconfiguration at the other end? Can you open
> other https urls?

This is really weird. Now it works this morning. I've spoken with our
webmaster/system admin and he said he didn't change anything on his
end. We're both befuddled. Sorry for the noise.

Mike
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Re: urllib error on urlopen

[Mike Driscoll]

On Sep 24, 9:36 pm, Steven D'Aprano <[EMAIL PROTECTED]
cybersource.com.au> wrote:
> On Wed, 24 Sep 2008 08:46:56 -0700, Mike Driscoll wrote:
> > Hi,
>
> > I have been using the following code for over a year in one of my
> > programs:
>
> > f = urllib2.urlopen('https://www.companywebsite.com/somestring')
>
> > It worked great until the middle of the afternoon yesterday. Now I get
> > the following traceback:
> ...
> > URLError:  > routines:SSL23_GET_SERVER_HELLO:unknown protocol')>
>
> Have you recently set a proxy where Python can auto-detect it? I
> understand that urllib2 doesn't work well with https proxies.
>
> If so, you can instruct urllib2 not to use a proxy-handler, but it's more
> work. What I do is construct an opener without a proxyhandler:
>
> # untested...
> no_proxy_support = urllib2.ProxyHandler({})
> opener = urllib2.build_opener(no_proxy_support)
> f = opener.open('https://www.companywebsite.com/somestring')
>
> If that doesn't work, you may need to build a Request object from the URL
> before passing it to opener.open.
>
> --
> Steven

As I mentioned to Mr. Palmer, the error has mysteriously gone away
this morning. I'll keep your advice handy though, in case it happens
again.

Thanks,

Mike
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ANN: eGenix pyOpenSSL Distribution 0.7.0-0.9.8i-1

[eGenix Team: M.-A. Lemburg]

ANNOUNCING

   eGenix.com pyOpenSSL Distribution

Version 0.7.0-0.9.8i-1


 An easy to install and use repackaged distribution
   of the pyOpenSSL Python interface for OpenSSL -
  available on Windows and Unix platforms


This announcement is also available on our web-site for online reading:
http://www.egenix.com/company/news/eGenix-pyOpenSSL-Distribution-0.7.0-0.9.8i-1-GA.html



INTRODUCTION

The eGenix.com pyOpenSSL Distribution includes everything you need to
get started with SSL in Python. It comes with an easy to use installer
that includes the most recent OpenSSL library versions in pre-compiled
form.

pyOpenSSL is an open-source Python add-on (http://pyopenssl.sf.net/)
that allows writing SSL aware networking applications as well as
certificate management tools.

OpenSSL is an open-source implementation of the SSL protocol
(http://www.openssl.org/).

* About Python:
Python is an object-oriented Open Source programming language which
runs on all modern platforms (http://www.python.org/). By integrating
ease-of-use, clarity in coding, enterprise application connectivity
and rapid application design, Python establishes an ideal programming
platform for todays IT challenges.

* About eGenix:
eGenix is a consulting and software product company focused on
providing professional quality services and products to Python
users and developers (http://www.egenix.com/).



NEWS

This second release of the eGenix.com pyOpenSSL Distribution upgrades
the included OpenSSL library version to the latest 0.9.8i, which includes
several bug fixes over the previously included 0.9.8h version.

The release also includes Python 2.6 support for the first time.

Binaries are available for Linux x86 and x64 as well as Windows x86.



DOWNLOADS

The download archives and instructions for installing the package can
be found at:

http://www.egenix.com/products/python/pyOpenSSL/



UPGRADING

Before installing this version of pyOpenSSL, please make sure that
you uninstall any previously installed pyOpenSSL version. Otherwise,
you could end up not using the included OpenSSL libs.

___

SUPPORT

Commercial support for these packages is available from eGenix.com.
Please see

http://www.egenix.com/services/support/

for details about our support offerings.

Enjoy,
-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Sep 25 2008)
>>> Python/Zope Consulting and Support ...http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...http://python.egenix.com/


 Try mxODBC.Zope.DA for Windows,Linux,Solaris,MacOSX for free ! 


   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
   Registered at Amtsgericht Duesseldorf: HRB 46611



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Re: How to get the filename in the right case ?

[Stef Mientki]

Diez B. Roggisch wrote:

Yes I'm pretty sure, two reasons:
1. when I perform a step_into, jumping into a file that doesn't have
breakpoints itself (meaning my program doesn't even know of this file),
pdb returns a lowercase filename



What has that to do with potential output postprocessing? 




  

2. rpdb2 (probably based or even inherited from pdb) has the same
behavior. Asking the writer of rpdb2, I got some excuse (which I didn't
understand) why he had done it that way.



rpdb2 is not pdb.

Below is the output of a Pdb-session I just had:


(eggbasket)[EMAIL PROTECTED]:~/software/vc/EggBasket$ nosetests -s
eggbasket.tests.test_model
2008-09-25 14:13:10,374 turbogears.identity.saprovider INFO Loading:
eggbasket.model.VisitIdentity
.> 
/home/dir/software/vc/EggBasket/eggbasket/tests/test_model.py(59)test_versionsets()
-> vi1 = vset.add_pkg_info(p1)
(Pdb) n
  

/home/dir/software/vc/EggBasket/eggbasket/tests/test_model.py(60)test_versionsets()


-> session.flush()
(Pdb) n


As you can see - mixed-case filenames. Linux though.

There is a *very* simple way for you to check: just create a file called

FooBar.py

and inside that, put

import pdb; pdb.set_trace()
print "hello"


Run that on the windows shell. See if that puts out all lowercase or not. I
can't do that right now as my VBox Windows won't start.
  

>>> import Module1
> d:\data_python_25\pylab_works\module1.py(3)()
-> print "hello"
(Pdb)


Then we know if PDB is really the culprit.

  

So pdb is the problem.

Apart from that, is that really a problem that the filenames are all lower
case? AFAIK Windows is case-insensitive regarding filenames anyway. So
opening the file by just passing the filename should work seamless.
  

Yes windows is,
but Python is not.
My program should run on Windows and Linux (and maybe a few others).
By converting everything to lowercase, on Linux I can't distinguishes 
between 2 files with the same name but a different case
(btw, giving 2 files the same name, only differing in case, looks like a 
bad idea to me).


And yes I could switch to lowercase in case I'm on a windows machine,
but my program is too beautiful to pollute the code with these kind of 
unnecessary statements ;-)


cheers,
Stef

Diez
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Python OOP question

[k3xji]

Hi all,

I am trying to develop a game-server in python. Design is as
following:

- ConnectionManager - handling/distributing incoming connections
- IOManager - handling IO recv/send operations on sockets.
(inheritable)
- Socket - basic async socket object
- SocketServer - handling multiple socket object requests.
(inheritable)
- Options - holds the server options (inheritable)

I want this code to be extensible as it can be. So I have developed it
like this. I f one is going to implement some new feature, all needs
to be done is to inherit IOManager or Server object to do it.
Inheritable objects are IOManager, SocketServer and Options.

But there is some feeling about this design that it can be better.
Here is the main.py which I am using to execute the server:

from Base.SocketServer import SocketServer
from testIOManager import testIOManager
from Base.Options import Options
from Base.ConnectionManager import ConnectionManager

iomgr = testIOManager()
opts = Options()

# calculate how many server objects to create
# according to the maximum allowed client count.
serverCnt = opts.MAX_CLIENT_COUNT / opts.MAX_CLIENT_COUNT_PER_SERVER
Servers = []
for i in range(serverCnt):
server = Server(i)
Servers.append(server)


cmgr = ConnectionManager(Servers, iomgr, opts)
cmgr.start()

With current design as server object is inheritable, I need to pass it
to ConnectionManager object. I just have a feeling that above design
is bad in the sense of readability.

Is there any paradigms. patterns specifically in Python for above like
situations, where in a library, we design some objects to be abstract
as possbile and other non-inheritable objects using the functions?

Or just any feedback on this Design structure?
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Re: How to parse a string completely into a list

[john . ford]

On Sep 25, 1:51 am, Tino Wildenhain <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> > On Sep 24, 10:12 pm, Matt Nordhoff <[EMAIL PROTECTED]> wrote:
> >> [EMAIL PROTECTED] wrote:
> >>> On Sep 24, 9:44 pm, "Chris Rebert" <[EMAIL PROTECTED]> wrote:
> 
>  Could you please define exactly what you mean by "elements" of a string?
>  If you mean characters, then just use list():>>> list("  \n \t abc")
>  [' ', ' ', '\n', ' ', '\t', ' ', 'a', 'b', 'c']
>  Regards,
>  Chris
> >>> Worked like a charm.
> >>> kudos!
> >> Why do you need to convert it to a list? Strings are sequences, so you
> >> can do things like slice them or iterate through them by character:
>
> > for character in "foo":
> >> ...     print character
> >> ...
> >> f
> >> o
> >> o
>
> >> --
>
> > The string draws a map that I then want to be able to traverse
> > through. If I can count through the individual characters of a list I
> > can create an x-y coordinate plane for navigation.
>
> You can 'count' (whatever that means) equally in strings as you do in
> lists. As said above, they behave exactly the same. Just strings
> are imutable - e.g. you can't change individual parts of them.
>
> Tino
>
> > --
> >http://mail.python.org/mailman/listinfo/python-list
>
>  smime.p7s
> 4KViewDownload

Ahh, but I forgot to mention that I have to mark the path I took in
the string. So using list() and then join() are my best options.

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Re: matplotlib in interactive mode locks when run from subprocess

[Almar Klein]

To who cares, I found out what my problem was.

Testing interactivity with Tk in a normal Python console gave proper
results, just like IPython. Also running "python -i" gives the
interactive behaviour I wanted. But running "python -i" from a subprocess
did not. I was startled, because it worked out of the box with Python!

I read somewhere that Tkinter does not need a mainloop, which should be
true in order to have the interactive behaviour in python without a second
thread. Well, tk does indeed not need a mainloop, but you DO need to
create a tk app and call update() on it from time to time. (Which makes
sense now that I know it :) )

After examing code from IPython, I saw that it runs code to start a Tk app,
and performs tk.update().

So I guess this means that the standard python shell creates such a
"hidden tk app", but NOT when run from a subprocess.

I have now solved my problem, and interactivity works!

Almar




2008/9/20 Almar Klein <[EMAIL PROTECTED]>

> I think my question was not very clear. I narrowed the problem down to
> a reconstructable small example, consisting of a python script (a very
> simple interpreter) and three lines to execute in it:
>
> == start simple interpreter file ==
> import os
> import sys
> import time
>
> def run():
> while True:
>
> # read a line of text, the thread is stuck here untill a \n is
> # fed to the stream.
> time.sleep(0.1)
> line = ""
> try:
> line = sys.stdin.readline()
> except Exception, why:
> sys.stdout.wite(why.message+"\n")
>
> if line:
> try:
> code = compile(line,"","exec")
> exec(code)
> except Exception, why:
> sys.stderr.write(why.message)
> sys.stderr.write(">>> ")
>
> if __name__ == "__main__":
> run()
>
> == end of file ==
>
> Now I run this file (by double clicking it) and I get a prompt. The three
> lines I type in are:
> import matplotlib.pylab as pl
> pl.ion() #interactive mode on
> pl.plot([1,2,3],[4,6,5])
>
> This produces a tk window, but it's unresponsive. The process does have 5
> threads, so
> matplotlib managed to create the threads, but it seems as if they're
> blocked.
>
> When I run the three lines of code in a normal python shell, I get the
> proper results:
> a responsive figure (I can zoom and pan) and my shell is still responsive
> too.
>
> I am in the dark why this does not work. Any thoughts anyone? I've been
> busy all day
> trying to get this right, with hardly any progress... :(
>
> Almar
>
> PS: I run windows xp, my matplotlibrc file has the backend: TkAgg,
> interactive: True
>
>
> 2008/9/18 Almar Klein <[EMAIL PROTECTED]>
>
> Hi,
>>
>> In wxpython, I made an interactive shell, which creates a remote python
>> subprocess
>> to do the interpreting. Communication is done via a pipe. The idea is that
>> the python
>> session is an actual process separate from the GUI, which has some
>> advantages,
>> like I can have multiple such shells in my application, and I can kill
>> them without
>> worrying that my wx app will crash.
>>
>> To do this I use the wx.Process class, which allows asynchronous
>> communication with
>> the remote process.
>>
>> This all works really, I will also launch wxpython apps. So I was quite
>> happy, untill I tried
>> doing some plotting with matplotlib (in TkAgg backend). The problem is
>> that the process
>> becomes unresponsive when I plot something (No prompt is written to the
>> stdout/stderr).
>> (more details below)
>>
>> I don't know much about creating subprocess and how they are different
>> from a normal
>> process. So can anyone offer some help as to what the problem might be?
>>
>> Thanks in advance,
>> Almar
>>
>> To get to the details:
>> - When I start a process with command "python -u -i"
>>   -- When interactive mode is off, the whole process becomes unresponsive
>> when doing
>>  pylab.show()
>>   -- When interactive mode in on, on doing pylab.plot(), a figure appears,
>> which I can
>> zoom etc., but the process is now stuck, also after closing the figure
>>
>> - When I start a process with command
>>   "python -u -c 'import code;code.interact(readfunc=raw_input)'"  (This is
>> how Pype does it).
>>   -- When interactive mode is off, the figures show when doing
>> pylab.show() and the process
>>  behaves as normal after closing the figure(s).
>>   -- When interactive mode in on, on doing pylab.plot(), a figure appears,
>> but most of the time
>>  it is not drawn and emmediately unresponsive, just like the process
>> itself.
>>
>> I have also tried an asynchronous Popen recipe by Joshiah Carlson I found
>> on
>> activestate. And I made my own process class using
>> win32process.CreateProcess.
>> Both alternatives to wx.Process resulted in the same sympoms.
>>
>> Oh, and I run windows.
>>
>>
>
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"which python" as a python command?

[chardish]

Hello,

I'm trying to find out in a script where the location of the current
python is. (I'm writing an installer script in python for a simple
server application, so i'm going to do a find-replace in a bunch of
files to give them the absolute path of the python binary.

One thought might be to use the subprocess module, run "which python"
as a subprocess, and then peek at stdout, but that seems way too
complicated. Is there a simple solution for this in just a few lines
of code?

Cheers,
Evan
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Re: "which python" as a python command?

[Carsten Haese]

[EMAIL PROTECTED] wrote:
> Hello,
> 
> I'm trying to find out in a script where the location of the current
> python is.

import sys
print sys.executable

HTH,

--
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http://informixdb.sourceforge.net
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PID management with popen and spawn

[EEK]

Hello,

 My goal is to start and stop separate Linux processes from a python
program by specific PID.  The output of these processes needs to have
their stderr and stdout piped to a particular file, respectively.

 I've been able to make this work with subprocess.Popen only if the
shell variable is set to False but I cannot pipe the outputs of the
targets.

 When using subprocess.Popen with shell=True, I believe the returned
PID is of the shell that opens the target process, not the target
process itself.  Therfore, I cannot stop the target process for the
returned PID is not of that process.

 Spawn will work better but I need the target application to pipe it's
stderr and stdout to a file.  Here I have troubles.

 Any help appreciated.

 prgm = program I want to run (compiled C)
 logfile = file I want to pipe output to

 What I need to do based on a simple shell call:  program >& logfile
(yes, that's it)

 proc = subprocess.Popen("program >&  logfile", shell=True,
env=os.environ)

 The above spawns the new process but proc.pid is not of 'program'.
Therefore, my python program cannot kill/stop it if needed.

 pidNum = os.spawnle(os.P_NOWAIT, "program >&  logfile",
pidName ,os.environ)
 This does not work.  "File not found"

 Thanks,

EEK




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Re: "which python" as a python command?

[chardish]

On Sep 25, 11:14 am, Carsten Haese <[EMAIL PROTECTED]> wrote:
> import sys
> print sys.executable

This is exactly what I needed. Thanks!
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How can I customize builtin module search path to prefix/lib to prefix/lib64?

[js]

Hi list,

Is it possible to change module search path (PYTHONPATH) built-in to
Python interpreter?
I thought I can change it with configure --libdir but it didn't work for me.
I also tried patching around python source tree replacing lib to lib64
but it didn't work either.

Adjusting sys.path directly or using environ should do the trick but
I'd rather want to make it the default path for my python

Thanks,
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Re: is decorator the right thing to use?

[Dmitry S. Makovey]

Diez B. Roggisch wrote:

> Dmitry S. Makovey schrieb:
>> Dmitry S. Makovey wrote:
>>> In my real-life case A is a proxy to B, C and D instances/objects, not
>>> just one.
>> 
>> forgot to mention that above would mean that I need to have more than one
>> decorator function like AproxyB, AproxyC and AproxyD or make Aproxy
>> smarter about which property of A has instance of which class etc.
> 
> __getattr__?

see, in your code you're assuming that there's only 1 property ( 'b' )
inside of A that needs proxying. In reality I have several. So in your code
self._delegate should be at least a tupple or a list. Plus what you're
doing - you just promiscuously passing any method not found in Proxy to
self._delegate which is not what I need as I need to pass only a subset of
calls, so now your code needs to acquire dictionary of "allowed" calls, and
go over all self._delegates to find if any one has it which is not
efficient since there IS a 1:1 mapping of A::method -> B::method so lookups
shouldn't be necessary IMO (for performance reasons).

> class Proxy(object):
> 
> 
>  def __init__(self, delegate):
>  self._delegate = delegate
> 
> 
>  def __getattr__(self, attr):
>  v = getattr(self._delegate, attr)
>  if callable(v):
> class CallInterceptor(object):
>   def __init__(self, f):
>   self._f = f
> 
>   def __call__(self, *args, **kwargs):
>   print "Called " + str(self._f) + " with " +
> str(args) + str(kwargs)
>   return self._f(*args, **kwargs)
> return CallInterceptor(v)
>  return v

> Decorators have *nothing* to do with this. They are syntactic sugar for
> def foo(...):
>  ...
> foo = a_decorator(foo)

exactly. and in my case they would've simplified code reading/maintenance.
However introduced "tight coupling" (A knows about B and be should know
about A) is something that worries me and I'm trying to figure out if there
is another way to use decorators for my scenario or is there another way of
achieving the same thing without using decorators and without bloating up
the code with alternative solution. 

Another way could be to use Metaclass to populate class with method upon
declaration but that presents quite a bit of "special" cruft which is more
than I have to do with decorators :) (but maybe it's all *necessary* ? )

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Re: How to get the filename in the right case ?

[OKB (not okblacke)]

Stef Mientki wrote:
> >>> import Module1
> > d:\data_python_25\pylab_works\module1.py(3)()
> -> print "hello"
> (Pdb)
> 
>> Then we know if PDB is really the culprit.
>>
>>   
> So pdb is the problem.

Yep, it does the same thing for me.

>> Apart from that, is that really a problem that the filenames are
>> all lower case? AFAIK Windows is case-insensitive regarding
>> filenames anyway. So opening the file by just passing the filename
>> should work seamless. 
>>   
> Yes windows is,
> but Python is not.
> My program should run on Windows and Linux (and maybe a few
> others). By converting everything to lowercase, on Linux I can't
> distinguishes between 2 files with the same name but a different
> case (btw, giving 2 files the same name, only differing in case,
> looks like a bad idea to me).

Hmmm, but I don't understand what you're doing here.  Are you 
somehow storing the filename that pdb outputs and you need to use it 
later on a potentially different OS?  If the case is preserved in pdb on 
linux, then presumably running it on linux will be fine, right?  It's 
only a problem if you somehow try to use a filename created by windows-
pdb to open a file (the same file, somehow) on linux.

-- 
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Brendan Barnwell
"Do not follow where the path may lead.  Go, instead, where there is
no path, and leave a trail."
--author unknown
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Re: is decorator the right thing to use?

[Dmitry S. Makovey]

Thanks Bruno,

your comments were really helpful (so was the "improved" version of code). 

My replies below:

Bruno Desthuilliers wrote:
>> So decorators inside of B just identify that those methods will be
>> proxied by A. On one hand from logical standpoint it's kind of weird to
>> tell class that it is going to be proxied by another class,
> 
> Indeed - usually, proxied objects shouldn't have to be aware of the
> fact. That doesn't mean your variation on the proxy pattern is
> necessarily bad design (hard to tell without lot of context anyway...),
> but still there's some alarm bell ringing here IMHO - IOW : possibly the
> right thing to do, but needs to be double-checked.

I'm kind of looking at options and not dead-set on decorators, but I can't
find any other "elegant enough" solution which wouldn't lead to such tight
coupling. The problem I'm trying to solve is not much more complicated than
what I have already described so if anybody can suggest a better approach -
I'm all for it. 

> Now I'm not sure I really like your implementation. Here's a possible
> rewrite using a custom descriptor:

yeah, that was going to be my next step - I was just aiming for
proof-of-concept more then efficient code :)

> class Proxymaker(object):
>  def __init__(self, attrname):
>  self.attrname = attrname
> 
>  def __get__(self, instance, cls):
>  def _proxied(fn):
>  fn_name = fn.__name__
>  def delegate(inst, *args, **kw):
>  target = getattr(inst, self.attrname)
>  #return fn(target, *args,**kw)
>  method = getattr(target, fn_name)
>  return method(*args, **kw)
> 
>  delegate.__name__ = "%s_%s_delegate" % \
>  (self.attrname, fn_name)
> 
>  setattr(cls, fn_name, delegate)
>  return fn
> 
>  return _proxied
> 
> class A(object):
>  def __init__(self,b):
>  self.val='aval'
>  self.b=b
>  b.val='aval'
> 
>  proxy2b = Proxymaker('b')
> 
>  def mymethod(self,a):
>  print "A::mymethod, ",a
> 
>  def mymethod2(self,a):
>  print "A::another method, ",a
> 
> class B(object):
>  def __init__(self):
>  self.val='bval'
> 
>  @A.proxy2b
>  def bmethod(self,a):
>  print "B::bmethod"
>  print a, self.val
> 
>  @A.proxy2b
>  def bmethod2(self,a):
>  print "B::bmethod2"
>  print a, self.val

> My point is that:
> 1/ you shouldn't have to rewrite a decorator function - with basically
> the same code - for each possible proxy class / attribute name pair combo
> 2/ making the decorator an attribute of the proxy class makes
> dependencies clearer (well, IMHO at least).

agreed on all points

> I'm still a bit uneasy wrt/ high coupling between A and B, and if I was
> to end up with such a design, I'd probably take some times to be sure
> it's really ok.

that is the question that troubles me at this point - thus my original post
(read the subject line ;) ). I like the clarity decorators bring to the
code and the fact that it's a solution pretty much "out-of-the-box" without
need to create something really-really custom, but I'm worried about tight
coupling and somewhat backward logic that they would introduce (the way I
envisioned them).


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Re: How to get the filename in the right case ?

[Stef Mientki]

OKB (not okblacke) wrote:

Stef Mientki wrote:
  

import Module1
  

d:\data_python_25\pylab_works\module1.py(3)()
  

-> print "hello"
(Pdb)



Then we know if PDB is really the culprit.

  
  

So pdb is the problem.



Yep, it does the same thing for me.

  

Apart from that, is that really a problem that the filenames are
all lower case? AFAIK Windows is case-insensitive regarding
filenames anyway. So opening the file by just passing the filename
should work seamless. 
  
  

Yes windows is,
but Python is not.
My program should run on Windows and Linux (and maybe a few
others). By converting everything to lowercase, on Linux I can't
distinguishes between 2 files with the same name but a different
case (btw, giving 2 files the same name, only differing in case,
looks like a bad idea to me).



	Hmmm, but I don't understand what you're doing here.  Are you 
somehow storing the filename that pdb outputs and you need to use it 
later on a potentially different OS?  If the case is preserved in pdb on 
linux, then presumably running it on linux will be fine, right?  It's 
only a problem if you somehow try to use a filename created by windows-

pdb to open a file (the same file, somehow) on linux.

  

1. I've a multitab editor.
2. When a breakpoint is reached,
3. I check if the file specified in pdb output, is already open in one 
of the editor tabs,

4. if not, I open a new tab with the correct file,
5. I focus the correct editor tab and jump to the line specified by pdb.
6. After that I should be able to inspect the surrounding of the 
breakpoint, so I need the modules name.


For 3 I need to compare filenames, the editor contains the case 
sensitive name, pdb not.
For 6 I also need the case sensitive filename, but probably there's 
another way to get the modules name.


For 3, I can indeed compare the lowercase version of both,
probably I'll do that for the moment.

thanks guys for the suggestions
Stef


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text processing

[[EMAIL PROTECTED]]

I have string like follow
12560/ABC,12567/BC,123,567,890/JK

I want above string to group like as follow
(12560,ABC)
(12567,BC)
(123,567,890,JK)

i try regular expression i am able to get first two not the third one.
can regular expression given data in different groups


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Re: is decorator the right thing to use?

[Bruno Desthuilliers]

Dmitry S. Makovey a écrit :

Thanks Bruno,

your comments were really helpful (so was the "improved" version of code). 


My replies below:

Bruno Desthuilliers wrote:

So decorators inside of B just identify that those methods will be
proxied by A. On one hand from logical standpoint it's kind of weird to
tell class that it is going to be proxied by another class,

>>>

Indeed - usually, proxied objects shouldn't have to be aware of the
fact. That doesn't mean your variation on the proxy pattern is
necessarily bad design (hard to tell without lot of context anyway...),
but still there's some alarm bell ringing here IMHO - IOW : possibly the
right thing to do, but needs to be double-checked.


I'm kind of looking at options and not dead-set on decorators, but I can't
find any other "elegant enough" solution which wouldn't lead to such tight
coupling. The problem I'm trying to solve is not much more complicated than
what I have already described 


Well... You didn't mention why you need a proxy to start with !-)



so if anybody can suggest a better approach -
I'm all for it. 


(snip code)


My point is that:
1/ you shouldn't have to rewrite a decorator function - with basically
the same code - for each possible proxy class / attribute name pair combo
2/ making the decorator an attribute of the proxy class makes
dependencies clearer (well, IMHO at least).


agreed on all points


I'm still a bit uneasy wrt/ high coupling between A and B, and if I was
to end up with such a design, I'd probably take some times to be sure
it's really ok.


that is the question that troubles me at this point - thus my original post
(read the subject line ;) ).  I like the clarity decorators bring to the
code and the fact that it's a solution pretty much "out-of-the-box" without
need to create something really-really custom, but I'm worried about tight
coupling and somewhat backward logic that they would introduce (the way I
envisioned them).


Well... The canonical solution for delegation in Python is using 
__getattr__. Your problem - according to this post and your answer to 
Diez - is that your proxy may have to

1/ delegate to more than one object
2/ don't necessarily delegate each and any attribute access

I can envision one solution using both __getattr__ and a simple decorator:

def proxy(func):
   func._proxied = True
   return func

class A(object):
def __init__(self, delegates):
self._delegates = delegates
def __getattr__(self, name):
for d in self.__delegate:
func = getattr(d, name)
if callable(func) and getattr(func, '_proxied', False):
return func
raise AttributeError(
  'object %s has no attribute '%s' % (self.__class__, name)
  )


class B(object):
def __init__(self):
self.val='bval'

@proxy
def bmethod(self,a):
print "B::bmethod"
print a, self.val

@proxy
def bmethod2(self,a):
print "B::bmethod2"
print a, self.val


class C(object):
def __init__(self):
self.val='bval'

@proxy
def cmethod(self,a):
print "B::bmethod"
print a, self.val

@proxy
def cmethod2(self,a):
print "B::bmethod2"
print a, self.val


a = A([B(), C()])

# not tested...


This solves most of the coupling problems (B and C still have to make 
clear which methods are to be proxied, but at least they need not know 
which class will be used as proxy), and makes sure only 'allowed' method 
calls are delegated. But I wouldn't call it a perfect solution neither. 
If you do have more than one object having method xxx, only the first 
one will match... And let's not talk about the lookup penalty.


There's a possible variant that avoids the call to __getattr__ (in 
short: attaching delegation instancemethods to A instance in the 
initializer for each proxied method in delegates), but that wont solve 
the problem of potential name clashes.



My 2 cents...




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Re: Er, one -lime- or two.

[Aaron "Castironpi" Brady]

On Sep 25, 3:09 am, Bruno Desthuilliers  wrote:
> Aaron "Castironpi" Brady a écrit :
>
> > A Python walks into a bar and orders a complex data structure.
> > Bartender says, "One line or two?"
>
> I don't think that one will have much success in parties !-)

It doesn't go to any.  =P
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Re: text processing

[Marc 'BlackJack' Rintsch]

On Thu, 25 Sep 2008 15:51:28 +0100, [EMAIL PROTECTED] wrote:

> I have string like follow
> 12560/ABC,12567/BC,123,567,890/JK
> 
> I want above string to group like as follow (12560,ABC)
> (12567,BC)
> (123,567,890,JK)
> 
> i try regular expression i am able to get first two not the third one.
> can regular expression given data in different groups

Without regular expressions:

def group(string):
result = list()
for item in string.split(','):
if '/' in item:
result.extend(item.split('/'))
yield tuple(result)
result = list()
else:
result.append(item)

def main():
string = '12560/ABC,12567/BC,123,567,890/JK'
print list(group(string))

Ciao,
Marc 'BlackJack' Rintsch
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Lotus Domino and Python via DIIOP or similar?

[Michael Ströder]

HI!

Anybody here with experience in accessing Lotus Domino with Python via
DIIOP? In particular I'd like to be able to register Notes users with a
Python script. Preferrably without having to use Win32 COM although it
would be better than nothing.

Adding address Notes book entries via LDAP is possible but AFAIK does
not lead to full Notes users (with mailbox and Notes-ID file).

Ciao, Michael.
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Re: is decorator the right thing to use?

[Aaron "Castironpi" Brady]

On Sep 25, 12:19 pm, Bruno Desthuilliers  wrote:
> Dmitry S. Makovey a écrit :
>
>
>
> > Thanks Bruno,
>
> > your comments were really helpful (so was the "improved" version of code).
>
> > My replies below:
>
> > Bruno Desthuilliers wrote:
> >>> So decorators inside of B just identify that those methods will be
> >>> proxied by A. On one hand from logical standpoint it's kind of weird to
> >>> tell class that it is going to be proxied by another class,
>
> >> Indeed - usually, proxied objects shouldn't have to be aware of the
> >> fact. That doesn't mean your variation on the proxy pattern is
> >> necessarily bad design (hard to tell without lot of context anyway...),
> >> but still there's some alarm bell ringing here IMHO - IOW : possibly the
> >> right thing to do, but needs to be double-checked.
>
> > I'm kind of looking at options and not dead-set on decorators, but I can't
> > find any other "elegant enough" solution which wouldn't lead to such tight
> > coupling. The problem I'm trying to solve is not much more complicated than
> > what I have already described
>
> Well... You didn't mention why you need a proxy to start with !-)
>
> > so if anybody can suggest a better approach -
> > I'm all for it.
>
> (snip code)
>
>
>
> >> My point is that:
> >> 1/ you shouldn't have to rewrite a decorator function - with basically
> >> the same code - for each possible proxy class / attribute name pair combo
> >> 2/ making the decorator an attribute of the proxy class makes
> >> dependencies clearer (well, IMHO at least).
>
> > agreed on all points
>
> >> I'm still a bit uneasy wrt/ high coupling between A and B, and if I was
> >> to end up with such a design, I'd probably take some times to be sure
> >> it's really ok.
>
> > that is the question that troubles me at this point - thus my original post
> > (read the subject line ;) ).  I like the clarity decorators bring to the
> > code and the fact that it's a solution pretty much "out-of-the-box" without
> > need to create something really-really custom, but I'm worried about tight
> > coupling and somewhat backward logic that they would introduce (the way I
> > envisioned them).
>
> Well... The canonical solution for delegation in Python is using
> __getattr__. Your problem - according to this post and your answer to
> Diez - is that your proxy may have to
> 1/ delegate to more than one object
> 2/ don't necessarily delegate each and any attribute access
>
> I can envision one solution using both __getattr__ and a simple decorator:
>
> def proxy(func):
>     func._proxied = True
>     return func
>
> class A(object):
>      def __init__(self, delegates):
>          self._delegates = delegates
>      def __getattr__(self, name):
>          for d in self.__delegate:
>              func = getattr(d, name)
>              if callable(func) and getattr(func, '_proxied', False):
>                  return func
>          raise AttributeError(
>                'object %s has no attribute '%s' % (self.__class__, name)
>                )
>
> class B(object):
>      def __init__(self):
>          self.val='bval'
>
>     [EMAIL PROTECTED]
>      def bmethod(self,a):
>          print "B::bmethod"
>          print a, self.val
>
>     [EMAIL PROTECTED]
>      def bmethod2(self,a):
>          print "B::bmethod2"
>          print a, self.val
>
> class C(object):
>      def __init__(self):
>          self.val='bval'
>
>     [EMAIL PROTECTED]
>      def cmethod(self,a):
>          print "B::bmethod"
>          print a, self.val
>
>     [EMAIL PROTECTED]
>      def cmethod2(self,a):
>          print "B::bmethod2"
>          print a, self.val
>
> a = A([B(), C()])
>
> # not tested...
>
> This solves most of the coupling problems (B and C still have to make
> clear which methods are to be proxied, but at least they need not know
> which class will be used as proxy), and makes sure only 'allowed' method
> calls are delegated. But I wouldn't call it a perfect solution neither.
> If you do have more than one object having method xxx, only the first
> one will match... And let's not talk about the lookup penalty.
>
> There's a possible variant that avoids the call to __getattr__ (in
> short: attaching delegation instancemethods to A instance in the
> initializer for each proxied method in delegates), but that wont solve
> the problem of potential name clashes.
>
> My 2 cents...

You should write it like this:

class B(object):
 @A.proxy
 def bmethod(self,a):

Making 'proxy' a class method on A.  In case different A instances (do
you have more than one BTW?) proxy different objects, you could make
it a plain old method.

a= A()
class B(object):
 @a.proxy
 def bmethod(self,a):

I recommend this solution so that if you add a method to a B instance
later, 'a' can be notified simply.:

b.meth3= a.proxy( meth3 )

The big problem with that is if 'a' has 'b' in its constructor.  You
can reverse that, since B 'knows' about it proxy object quite a bit
anyway.

What you've said im

Hello guys!!!!!

[Goran Barac Cvrcko]

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Bosnia and Herzegovina, also known as Cvrcko
Does anyone know of any bars in town where I can
swallow a bucket of cum? It can be either dog,
horse or human cum. Also, does anyone know of
any sex bars where people will shit in your mouth?
I also like eating shit.

--
Name: Goran Barac - Cvrcko
Street adress: Ive Andrica 23
Town: 78000 Banja Luka
Country: Bosnia and Herzegovina
Home phone: +38751/332-113
Cell phone: +38765/776-556
Email adress: [EMAIL PROTECTED]

~

The new pumpkin rarely pulls Terrance, it teases Sharon instead.  For
Susan the tape's sad, beside me it's unique, whereas against you it's
believing dirty.  Hey, go reject a fork!  Why did Alice open
throughout all the boats?  We can't explain poultices unless
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will
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partly taste pins, the powders often excuse against the blunt
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Oscar easily scolds them too.  You eventually fill against Norma when
the
kind drapers irritate among the poor summer.  As surprisingly as
Dolf converses, you can dye the cap much more familiarly.  Brion,
still
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improves among our desk after we sow towards it.  Ralph measures the
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David, and they rigidly walk Quincy too.  When Richard's elder
gardner dreams, Mark cares for weak, closed islands.  He might
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bathroom.  I creep the active yogi and cook it in back of its
dorm.  Tell Katherine it's strong loving within a tree.  Why will you
jump the angry lower exits before Murray does?  I am unbelievably
bitter, so I wander you.  How does Hector smell so regularly, whenever
Ronald likes the solid twig very slowly?

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join a dryer!  She wants to nibble inner smogs under Usha's castle.
She'd rather
depart grudgingly than help with Bernadette's younger grocer.  Other
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answers quietly.  What doesn't Janet smell inadvertently?  They are
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light long game covers pools outside Woodrow's rich film.  Why did
Oscar judge the pear with the handsome spoon?  He will talk nearly if
Julieta's tailor isn't wet.

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Woody to care it.  Both filling now, Alejandro and Marty irritated the
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in back of the counter's stable.  It can receive clean pickles, do you
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tease them, then we weekly dream Zack and Annabel's blank candle.
A lot of shallow dose or canyon, and she'll locally excuse everybody.
If the
bizarre balls can sow bimonthly, the hollow raindrop may love more
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Jimmie's puddle.  Jimmy!  You'll mould plates.  Just now, I'll
dine the bandage.  All glad str

Re: How can I customize builtin module search path to prefix/lib to prefix/lib64?

[Mike Driscoll]

On Sep 25, 10:41 am, js <[EMAIL PROTECTED]> wrote:
> Hi list,
>
> Is it possible to change module search path (PYTHONPATH) built-in to
> Python interpreter?
> I thought I can change it with configure --libdir but it didn't work for me.
> I also tried patching around python source tree replacing lib to lib64
> but it didn't work either.
>
> Adjusting sys.path directly or using environ should do the trick but
> I'd rather want to make it the default path for my python
>
> Thanks,

Why not just add a custom path file (*.pth)? EasyInstall, wx, PyWin32
and others do it. Of course there's always sys.path.append as well.

Mike
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Re: is decorator the right thing to use?

[Dmitry S. Makovey]

Aaron "Castironpi" Brady wrote:
> You should write it like this:
> 
> class B(object):
>  @A.proxy
>  def bmethod(self,a):
> 
> Making 'proxy' a class method on A.  

makes sense.

> In case different A instances (do 
> you have more than one BTW?) 

yep. I have multiple instances of class A, each one has properties (one per
class) of classes B, C and D:

class A:
b=None
c=None
d=None
def __init__(self,b,c,d):
self.b=b
self.c=c
self.d=d

...magic with proxying methods goes here...

class B: 
def bmethod(self,x): pass # we proxy this method from A
def bmethod2(self,x): pass # this is not proxied
class C: 
def cmethod(self,x): pass # we proxy this method from A
class D: 
def dmethod(self,x): pass # we proxy this method from A

a=A(B(),C(),D())
x='foo'
a.bmethod(x)
a.cmethod(x)
a.dmethod(x)
a.bmethod2(x) # raises error as we shouldn't proxy bmethod2

above is the ideal scenario. 

> What you've said implies that you only have one B instance, or only
> one per A instance.  Is this correct?

yes. as per above code.

> I agree that __setattr__ is the canonical solution to proxy, but you
> have stated that you want each proxied method to be a member in the
> proxy class.

well. kind of. if I can make it transparent to the consumer so that he
shouldn't do:

a.b.bmethod(x)

but rather:

a.bmethod(x)

As I'm trying to keep b, c and d as private properties and would like to
filter which calls are allowed to those. Plus proxied methods in either one
always expect certain parameters like:

class B:
def bmethod(self,c,x): pass

and A encapsulates 'c' already and can fill in that blank automagically:

class A:
c=None
b=None
def bmethod(self,c,x):
if not c:
c=self.c
b.bmethod(self,c,x)

I kept this part of the problem out of this discussion as I'm pretty sure I
can fill those in once I figure out the basic problem of auto-population of
proxy methods since for each class/method those are going to be nearly
identical. If I can autogenerate those on-the-fly I'm pretty sure I can add
some extra-logic to them as well including signature change where
A::bmethod(self,c,x) would become A::bmethod(self,x) etc.


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Re: is decorator the right thing to use?

[Aaron "Castironpi" Brady]

On Sep 25, 1:22 pm, "Dmitry S. Makovey" <[EMAIL PROTECTED]> wrote:
> Aaron "Castironpi" Brady wrote:
> > You should write it like this:
>
> > class B(object):
> >     [EMAIL PROTECTED]
> >      def bmethod(self,a):
>
> > Making 'proxy' a class method on A.  
>
> makes sense.
>
> > In case different A instances (do
> > you have more than one BTW?)
>
> yep. I have multiple instances of class A, each one has properties (one per
> class) of classes B, C and D:
>
> class A:
>         b=None
>         c=None
>         d=None
>         def __init__(self,b,c,d):
>                 self.b=b
>                 self.c=c
>                 self.d=d
>
>         ...magic with proxying methods goes here...
>
> class B:
>         def bmethod(self,x): pass # we proxy this method from A
>         def bmethod2(self,x): pass # this is not proxied
> class C:
>         def cmethod(self,x): pass # we proxy this method from A
> class D:
>         def dmethod(self,x): pass # we proxy this method from A
>
> a=A(B(),C(),D())
> x='foo'
> a.bmethod(x)
> a.cmethod(x)
> a.dmethod(x)
> a.bmethod2(x) # raises error as we shouldn't proxy bmethod2
>
> above is the ideal scenario.
>
> > What you've said implies that you only have one B instance, or only
> > one per A instance.  Is this correct?
>
> yes. as per above code.
>
> > I agree that __setattr__ is the canonical solution to proxy, but you
> > have stated that you want each proxied method to be a member in the
> > proxy class.
>
> well. kind of. if I can make it transparent to the consumer so that he
> shouldn't do:
>
> a.b.bmethod(x)
>
> but rather:
>
> a.bmethod(x)
>
> As I'm trying to keep b, c and d as private properties and would like to
> filter which calls are allowed to those. Plus proxied methods in either one
> always expect certain parameters like:
>
> class B:
>         def bmethod(self,c,x): pass
>
> and A encapsulates 'c' already and can fill in that blank automagically:
>
> class A:
>         c=None
>         b=None
>         def bmethod(self,c,x):
>                 if not c:
>                         c=self.c
>                 b.bmethod(self,c,x)
>
> I kept this part of the problem out of this discussion as I'm pretty sure I
> can fill those in once I figure out the basic problem of auto-population of
> proxy methods since for each class/method those are going to be nearly
> identical. If I can autogenerate those on-the-fly I'm pretty sure I can add
> some extra-logic to them as well including signature change where
> A::bmethod(self,c,x) would become A::bmethod(self,x) etc.

Do you want to couple instances or classes together?

If A always proxies for B, C, and D, then the wrapper solution isn't
bad.  If you're going to be doing any instance magic, that can change
the solution a little bit.

There's also a revision of the first implementation of Aproxy you
posted, which could stand alone as you have it, or work as a
classmethod or staticmethod.

> def Aproxy(fn):
> def delegate(*args,**kw):
> print "%s::%s" % (args[0].__class__.__name__,fn.__name__)
> args=list(args)
> b=getattr(args[0],'b')
> fnew=getattr(b,fn.__name__)
> # get rid of original object reference
> del args[0]
> fnew(*args,**kw)
> setattr(A,fn.__name__,delegate)
> return fn

def Aproxy(fn):
def delegate(self,*args,**kw):
print "%s::%s" % (args[0].__class__.__name__,fn.__name__)
fnew=getattr(self.b,fn.__name__)
return fnew(*args,**kw)
setattr(A,fn.__name__,delegate)
return fn
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Re: python timers and COM/directshow

[Sayanan Sivaraman]

Ok, so I actually found a solution to this out there, and decided I'd
post back here and share it.

import pygtk
pygtk.require('2.0')
import gtk
import ctypes
from ctypes import *
from comtypes import client
from ctypes.wintypes import *
import gobject

def delete_event(widget,event,data=None):
global filter_builder, filter_graph, media_control, vseek
media_control.Stop
vseek.Release
filter_builder.Release
GUIDATA.win1.Release
media_control.Release
filter_graph.Release
del GUIDATA.win1
del filter_graph
del vseek
del filter_builder
del media_control
del all
sys.exit([status])
os._exit(status)
gtk.main_quit()
exit()
return False

def pauser(widget,data=None):
global media_control,playing, scrollbar, vseek
if GUIDATA.data_loaded==0:
return 0
scrollbar.set_value(vseek.CurrentPosition*30)
media_control.Pause()
playing=0
return 0

def player(widget,data=None):
global media_control, vseek, scrollbar,playing
if GUIDATA.data_loaded==0:
return 0
media_control.Run()
playing=1
gobject.timeout_add(1,on_timer,scrollbar)

def scrollbar_callback(widget,scroll, data=None):
global media_control, vseek
vseek.CurrentPosition= scrollbar.get_value()/30
return 0
def on_timer(data=None):
global scrollbar, vseek, playing, media_control
if (playing==1)and
(vseek.CurrentPosition*30)http://mail.python.org/mailman/listinfo/python-list

Eggs, VirtualEnv, and Apt - best practices?

[Scott Sharkey]

Hello all,

Our development group at work seems to be heading towards adopting 
python as one of our standard "systems languages" for internal 
application development (yeah!).  One of the issues that's come up is 
the problem with apt (deb packages) vs eggs, vs virtual environments.

We're probably gonna end up using Pylons or TurboGears for web-based
apps, and I've recommended virtualenv, but one of the other developers 
has had some "inconsistencies" when mixing systems with python installed 
from apt (all our servers are debian or ubuntu based) vs when installed 
under virtualenv.


I have basically recommended that we only install the python base (core 
language) from apt, and that everything else should be installed into 
virtual environments. But I wanted to check to see how other enterprises
are handling this issue?  Are you building python from scratch, or using 
specific sets of .deb packages, or some other process.


Any insight into the best way to have a consistent, repeatable, 
controllable development and production environment would be much 
appreciated.


Suggestions on build/rollout tools (like zc.buildout, Paver, etc) would 
also be appreciated.


Thanks!!!

-Scott
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Re: text processing

[kib2]

You can do it with regexps too :

>--
import re
to_watch = re.compile(r"(?P\d+)[/](?P[A-Z]+)")

final_list = to_watch.findall("12560/ABC,12567/BC,123,567,890/JK")

for number,word in final_list :
print "number:%s -- word: %s"%(number,word)
>--

the output is :

number:12560 -- word: ABC
number:12567 -- word: BC
number:890 -- word: JK

See you,

Kib².
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PEP Proposal

[python-pep]

Hi,

sorry, I have these ideas for longer than 10 years, please have a look on it
and comment on it. Thx.




This is another proposal for introducing types into Python.

There are many reasons for incorporating types into Python, but there is
also a lot of concern about doing so because of destroying the original
character of Python as a smart script language.

This proposal adds several advantages of Prolog(ue) techniques without
changing the natural understanding of Python as a language.


Proposal:

1. Method definitions can be non-unique if a type is prefixed to one or more
of its parameters, or the parameters differ in number.

2. A keyword 'reject' is added.

3. A keyword 'fail' is added.

4. A keyword 'cut' is added.


Definition:

1. A "type" is a String naming the actual class or class family which the
passed instanced is derived from, prefixing the parameter.

2. "'reject'" is a marker inside a function/method and signals that further
processing will not be done inside this method, but instead be passed to the
next available function/method in row, otherwise an implicit "fail" will
occur.

3. "'fail'" is a marker inside a function/method and signals that NO further
processing can be done in neither of this or the following
functions/methods.

4. "'cut'" is a marker inside a function/method that signals that the
failure of called functions/methods inside of it, following this statement,
automatically lead to a failure, instead of trying the next method -
normally, it would be "reject" instead.

5. Failure of functions/methods to outside of this new context are signalled
with a new exception e.g. "MethodRetrialError".



E.g.

def whoisthethief("List" x):
  return iknowit(x)

def whoisthethief("String" x, "String" y):
  return iknowit([x,y])

##

def numeral_add(a, b):
  if type(a)!=types.IntType:
reject
  ...

# equivalent to:

def numeral_add("Integer" a, b):
  ...


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Re: is decorator the right thing to use?

[Bruno Desthuilliers]

Aaron "Castironpi" Brady a écrit :
(snip)

You should write it like this:

class B(object):
 @A.proxy
 def bmethod(self,a):

Making 'proxy' a class method on A.


That's exactly what I wanted to avoid here : making B depending on A.

(snip)


I agree that __setattr__ is the canonical solution to proxy,


Err... I assume you mean '__getattr__' ???


but you
have stated that you want each proxied method to be a member in the
proxy class.


This doesn't necessarily imply that "proxied" classes need to know about 
 the "proxying" class. FWIW, that was the whole point : decoupling.


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Quick sort implementation in python

[Alex Snast]

Hi guys, I've been learning python in the past week and tried to
implement a q.sort algorithm in python as follows:

def quick_sort(l, first, last)
if first < last:
q = partition(a, first, last)
quick_sort(a, first, q - 1)
quick_sort(a, q + 1, last)

def partition(a, first, last):
import random
pivot = random.randomint(first, last)
a[last], a[pivot] = a[pivot], a[last]

i = first
for j in range(first, last):
if a[j] <= a[last]:
a[i], a[j] = a[j], a[i]
i += 1
a[i], a[last] = a[last], a[i]
return i

Now as you can see I'm passing my list object to both functions along
with their first, last indices

My question is: Is that the normal way to implement algorithms in
python cause in c++ i've implemented that algo via a template function
which can have a randon access data structure or not. However i have
no idea how to access the values of a data structure that doesn't
allow random access.

Thanks, Alex
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Re: How to get the filename in the right case ?

[Stef Mientki]

I found a partial workaround that is good enough for me:

def Get_Windows_Filename ( FileName ) :
 if os.name == 'nt' :
   File = os.path.splitext ( FileName .lower ())[0]
   return glob.glob ( File + '.p?' )
 return FileName

This will translate the filename into the correct case, but not the path.

I also looked at os.path.walk, but that's too slow for me,
because getting the path correct means I have to start at the root.

cheers,
Stef
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Re: is decorator the right thing to use?

[Dmitry S. Makovey]

Aaron "Castironpi" Brady wrote:
>> I kept this part of the problem out of this discussion as I'm pretty sure
>> I can fill those in once I figure out the basic problem of
>> auto-population of proxy methods since for each class/method those are
>> going to be nearly identical. If I can autogenerate those on-the-fly I'm
>> pretty sure I can add some extra-logic to them as well including
>> signature change where A::bmethod(self,c,x) would become
>> A::bmethod(self,x) etc.
> 
> Do you want to couple instances or classes together?

It would be nice to have objects of B, C and D classes not knowing that they
are proxied (as they are used on their own too, not only inside of A
objects). 

> If A always proxies for B, C, and D, then the wrapper solution isn't
> bad. 

the whole purpose of A is pretty much to proxy and filter. It's got some
extra logic to combine and manipulate b, c and d objects inside of A class
objects.

> If you're going to be doing any instance magic, that can change 
> the solution a little bit.
> 
> There's also a revision of the first implementation of Aproxy you
> posted, which could stand alone as you have it, or work as a
> classmethod or staticmethod.
> 
> def Aproxy(fn):
> def delegate(self,*args,**kw):
> print "%s::%s" % (args[0].__class__.__name__,fn.__name__)
> fnew=getattr(self.b,fn.__name__)
> return fnew(*args,**kw)
> setattr(A,fn.__name__,delegate)
> return fn

yep, that does look nicer/cleaner :)
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Re: curses.setsyx()?

[linkmaster032000]

On Sep 25, 2:39 am, Tim Roberts <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> >On Sep 23, 4:16 pm, [EMAIL PROTECTED] wrote:
> >> On Sep 22, 11:24 pm, Tim Roberts <[EMAIL PROTECTED]> wrote:
> >> > [EMAIL PROTECTED] wrote:
> >> > >On Sep 19, 6:42 pm, [EMAIL PROTECTED] wrote:
> >> > >> On Sep 19, 1:24 am, Tim Roberts <[EMAIL PROTECTED]> wrote:
>
> >> > >> > [EMAIL PROTECTED] wrote:
>
> >> > >> > >I tried curses.setsyx(2,3) in my script and it doesn't move the 
> >> > >> > >curses
> >> > >> > >cursor. Any alternatives/solutions?
> >>...
> >> > >> I added it and it still doesn't work. This is what I'm doing when I
> >> > >> want to display the cursor and prepare it for input at 2,3:
>
> >> > >> curses.echo()
> >> > >> curses.curs_set(1)
> >> > >> curses.setsyx(2,3)
> >> > >> curses.doupdate()
>
> >> > >Any idea what's wrong?
>
> >>http://pastebin.com/m6413db1
>
> >> Run that and press 'n' key. It is supposed to move the cursor to 2,3
> >> and it doesn't.
>
> Of course it does.  It moves the cursor, then does an update, then
> immediately calls draw.game, which redraws the screen and moves the cursor.
> If you want curses.setsyx (or the equivalent and more mnemonic scr.move) to
> leave the cursor somewhere, you can't draw more text afterward.
> --
> Tim Roberts, [EMAIL PROTECTED]
> Providenza & Boekelheide, Inc.

OH Thank you!!!
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Re: Eggs, VirtualEnv, and Apt - best practices?

[Dmitry S. Makovey]

Scott Sharkey wrote:
> Any insight into the best way to have a consistent, repeatable,
> controllable development and production environment would be much
> appreciated.

you have just described OS package building ;)

I can't speak for everybody, but supporting multiple platforms (PHP, Perl,
Python, Java) we found that the only way to stay consistent is to use OS
native packaging tools (in your case apt and .deb ) and if you're missing
something - roll your own package. After a while you accumulate plenty of
templates to chose from when you need yet-another-library not available
upstream in your preferred package format. Remember that some python tools
might depend on non-python packages, so the only way to make sure all that
is consistent across environment - use unified package management.

Sorry, not specific pointers though as we're redhat shop and debs are not
our everyday business.
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Re: PEP Proposal

[Gabriel Genellina]

En Thu, 25 Sep 2008 16:24:58 -0300, <[EMAIL PROTECTED]> escribió:

sorry, I have these ideas for longer than 10 years, please have a look  
on it

and comment on it. Thx.

This is another proposal for introducing types into Python.


You got the terminology wrong. Python had "types" from the very start.  
You're talking about some kind of generic functions, or an alternative  
dispatch method.


Read this GvR blog post [1] and his next one; also see PEP 3124 by Phillip  
J. Eby, who wrote a pretty good implementation of generic functions a long  
time ago.


Your proposal requires a syntax change and three new keywords; all the  
others achieve roughly equivalent results without requiring any change to  
the core language.


[1] http://www.artima.com/weblogs/viewpost.jsp?thread=155123

--
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Re: adding in-place operator to Python

[Arash Arfaee]

Thank you very much Gerhard and Terry.

I am trying to add undefined state to some Boolean operator. Here is what I
tried to do and It is not working:

class _3ph:
def __init__(self):
self.value = 0

def __xor__(self,item):
if self.value==2 or item==2:
 return 2
else:
 return self.__xor__(item)

what I am trying to do is assigning 2 to undefined state and have xor
operator return 2 if one of inputs are 2.
it seems Although I defined xor in _3ph class, python treat any object from
this class just like integer variables.
can you help me find what is wrong here?

Cheers,
Arash


On Tue, Sep 23, 2008 at 11:06 AM, Terry Reedy <[EMAIL PROTECTED]> wrote:

> Arash Arfaee wrote:
>
>> Hi All,
>>
>> Is there anyway to add new in-place operator to Python? Or is there any
>> way to redefine internal in-place operators?
>>
>
> Python does not have 'in-place operators'.  It has 'augmented assignment
> statements' that combines a binary operation with an assignment.  *If* the
> target being rebound is mutable, *then* (and only then) the operation can be
> and is recommended to be done 'in-place'.  User-defined mutable classes (as
> most are) can implement in-place behavior with __ixxx__ methods.  But for
> the reason given below, __ixxx__ methods should supplement and not replace
> direct mutation methods.
>
> Correct terminology is important for understanding what augmented
> assigments do and what they are basically about.
>
> First, most augmented assignments target immutables, in particular, numbers
> and strings, which do not have __ixxx__ methods.  So the operation is *not*
> done in-place.  The only difference from separately indicating the
> assignment and operation is that the programmer writes the target expression
> just once and the interpreter evaluates the target expression just once
> instead of each repeating themselves.  (And consequently, any side-effects
> of that evaluation happen just once instead of twice.)  The same __xxx__ or
> __rxxx__ method is used in either case.  This non-repetition is the reason
> for augmented assigments.  The optional in-place optimization for mutables
> is secondary.  It was debated and could have been left out.
>
> Second, all augmented assignments perform an assignment, even if the
> operation is done in place.  However, if a mutable such as a list is
> accessed as a member of an immutable collection such as a tuple, mutation is
> possible, but rebinding is not.  So the mutation is done and then an
> exception is raised.  To avoid the exception, directly call a mutation
> method such as list.extend.
>
> Terry Jan Reedy
>
>
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>
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Re: is decorator the right thing to use?

[George Sakkis]

On Sep 25, 3:36 pm, "Dmitry S. Makovey" <[EMAIL PROTECTED]> wrote:

> Aaron "Castironpi" Brady wrote:
> >> I kept this part of the problem out of this discussion as I'm pretty sure
> >> I can fill those in once I figure out the basic problem of
> >> auto-population of proxy methods since for each class/method those are
> >> going to be nearly identical. If I can autogenerate those on-the-fly I'm
> >> pretty sure I can add some extra-logic to them as well including
> >> signature change where A::bmethod(self,c,x) would become
> >> A::bmethod(self,x) etc.
>
> > Do you want to couple instances or classes together?
>
> It would be nice to have objects of B, C and D classes not knowing that they
> are proxied (as they are used on their own too, not only inside of A
> objects).

I'm not sure if the approach below deals with all the issues, but one
thing it does is decouple completely the proxied objects from the
proxy:

# usage


from proxies import Proxy

class B(object):
def __init__(self): self.val = 'bval'
def bmethod(self,n): print "B::bmethod",n
def bmethod2(self,n,m): print "B::bmethod2",n,m

class C(object):
def __init__(self): self.val = 'cval'
def cmethod(self,x): print "C::cmethod",x
def cmethod2(self,x,y): print "C::cmethod2",x,y
cattr = 4

class A(Proxy):
DelegateMap = {
'bmethod' : B,
'bmethod2': B,
'cmethod': C,
# do NOT delegate C.cmethod2
#'cmethod2': C,
'cattr'   : C,
}

def __init__(self, b, c):
print "init A()"
# must call Proxy.__init__(*delegates)
super(A,self).__init__(b,c)

def amethod(self,a):
print "A::mymethod",a


if __name__ == '__main__':
a = A(B(), C())
a.amethod('foo')

# test bounded methods
a.bmethod('foo')
a.bmethod2('bar','baz')
a.cmethod('foo')
try: a.cmethod2('bar','baz')
except Exception, ex: print ex

# works for unbound methods too
A.bmethod(a,'foo')
A.bmethod2(a,'bar','baz')
A.cmethod(a, 'foo')
try: A.cmethod2(a,'bar','baz')
except Exception, ex: print ex

# non callable attributes
print A.cattr

#== output ==
init A()
A::mymethod foo
B::bmethod foo
B::bmethod2 bar baz
C::cmethod foo
'A' object has no attribute 'cmethod2'
B::bmethod foo
B::bmethod2 bar baz
C::cmethod foo
type object 'A' has no attribute 'cmethod2'
4

# proxies.py =

class _ProxyMethod(object):
def __init__(self, name):
self._name = name
def unbound(proxy, *args, **kwds):
method = proxy._get_target_attr(name)
return method(*args, **kwds)
self._unbound = unbound

def __get__(self, proxy, proxytype):
if proxy is not None:
return proxy._get_target_attr(self._name)
else:
return self._unbound


class _ProxyMeta(type):
def __new__(meta, name, bases, namespace):
for attrname,cls in namespace.get('DelegateMap',
{}).iteritems():
if attrname not in namespace:
attr = getattr(cls, attrname)
if callable(attr):
namespace[attrname] = _ProxyMethod(attrname)
else:
namespace[attrname] = attr
return super(_ProxyMeta,meta).__new__(meta, name, bases,
namespace)


class Proxy(object):
__metaclass__ = _ProxyMeta

def __init__(self, *delegates):
self._cls2delegate = {}
for delegate in delegates:
cls = type(delegate)
if cls in self._cls2delegate:
raise ValueError('More than one %s delegates were
given' % cls)
self._cls2delegate[cls] = delegate

def _get_target_attr(self, name):
try:
cls = self.DelegateMap[name]
delegate = self._cls2delegate[cls]
return getattr(delegate, name)
except (KeyError, AttributeError):
raise AttributeError('%r object has no attribute %r' %
 (self.__class__.__name__, name))

HTH,
George
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Re: Quick sort implementation in python

[Bruno Desthuilliers]

Alex Snast a écrit :

Hi guys, I've been learning python in the past week and tried to
implement a q.sort algorithm in python


Is that for learning purpose ? Else, it's just a waste of time...

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Re: PEP Proposal

[python-pep]

Gabriel Genellina wrote:

> En Thu, 25 Sep 2008 16:24:58 -0300, <[EMAIL PROTECTED]> escribió:
> 
>> sorry, I have these ideas for longer than 10 years, please have a look
>> on it
>> and comment on it. Thx.
>>
>> This is another proposal for introducing types into Python.
> 
> You got the terminology wrong. Python had "types" from the very start.
> You're talking about some kind of generic functions, or an alternative
> dispatch method.

Typed parameters. Method-Declaration-filtered-typed parameters. That's what
I'm thinking of.

I hear & I will answer.
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Re: Eggs, VirtualEnv, and Apt - best practices?

[Fredrik Lundh]

Dmitry S. Makovey wrote:


you have just described OS package building ;)

I can't speak for everybody, but supporting multiple platforms (PHP, Perl,
Python, Java) we found that the only way to stay consistent is to use OS
native packaging tools (in your case apt and .deb ) and if you're missing
something - roll your own package. After a while you accumulate plenty of
templates to chose from when you need yet-another-library not available
upstream in your preferred package format. Remember that some python tools
might depend on non-python packages, so the only way to make sure all that
is consistent across environment - use unified package management.


you're speaking for lots of organizations, at least.

rpm/debs from supplier's repository
subversion (or equivalent) -> locally built rpm/debs
  + organization's favourite deployment tools
-
deployed application



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Re: Eggs, VirtualEnv, and Apt - best practices?

[Diez B. Roggisch]

Scott Sharkey schrieb:

Hello all,

Our development group at work seems to be heading towards adopting 
python as one of our standard "systems languages" for internal 
application development (yeah!).  One of the issues that's come up is 
the problem with apt (deb packages) vs eggs, vs virtual environments.

We're probably gonna end up using Pylons or TurboGears for web-based
apps, and I've recommended virtualenv, but one of the other developers 
has had some "inconsistencies" when mixing systems with python installed 
from apt (all our servers are debian or ubuntu based) vs when installed 
under virtualenv.


I have basically recommended that we only install the python base (core 
language) from apt, and that everything else should be installed into 
virtual environments. But I wanted to check to see how other enterprises
are handling this issue?  Are you building python from scratch, or using 
specific sets of .deb packages, or some other process.


Any insight into the best way to have a consistent, repeatable, 
controllable development and production environment would be much 
appreciated.


This is the exact way we are deploying our software. You can even use 
the virtualenv --no-site-packages option to completely isolate the VE 
from the underlying system site-packages.


I would recommend that all you install into the system python is 
virtualenv, and maybe some uncritical C-modules such as psycopg2.


Currently there is much going on regarding setuptools. A fork, 
"Distribute" has been announced, and "pyinstall" by Ian Bicking, an 
easy_install replacement that deals with some of it's ancestors 
shortcomings.


Then people (shameless plug warning: including me) are working on 
"eggbasket", a PYPI-clone that allows to have a local repository of eggs 
so that you don't fall prey to old versions not longer available on PYPI.


Eggbasket will feature "easterbunny", a tool to publish a virtualenv as 
whole to the eggbasket and also keep track of the precise version set 
uploaded. Through a specific url on eggbasket you can then limit the 
contents of eggbasket to that exact version set - which helps dealing 
with subtle (or not so subtle) version conflicts.


I personally can say that I'm really thrilled by the prospects of all 
these developments. And as much bad rap as setuptools had here and 
elsewhere, sometimes rightfully so - it certainly does a lot of stuff 
right, and pushing the whole stack of tools to manage software 
dependencies in Python to the next level is of great value.


Diez
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Re: Matrix programming

[Gary Herron]

A. Joseph wrote:
If my question was not understandable, tell me and stop pointing me to 
such page.


Your question was completely understandable, but so incredibly vague as 
to be a waste of bandwidth to send and a waste of time to answer.


What kind of matrix programming do you refer to?

Many sub-fields of mathematics, many sub-fields of engineering,  most 
all sub-fields of physics, (indeed most sciences), the fields of 
probability and statistics, robotics, most any kind of simulation, 
computer graphics, geometric modeling, etc., etc.  ALL use matrices and 
ALL use them differently.


I could give you references for matrix programming in half those fields, 
and others could surely extend my list by a factor of at least 10.


So... What is it you are asking for.  And as pointed out in the one 
reference I did give you, be explicit enough to help others understand 
*what* it is you want!


Gary Herron



On 9/23/08, *Gary Herron* <[EMAIL PROTECTED] 
> wrote:


A. Joseph wrote:


I need an ebook or tutorial that teach matrix programming.


Perhaps you should start here:
 http://www.catb.org/~esr/faqs/smart-questions.html#intro


Gary Herron



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Re: Eggs, VirtualEnv, and Apt - best practices?

[Nick Craig-Wood]

Scott Sharkey <[EMAIL PROTECTED]> wrote:
B>  Our development group at work seems to be heading towards adopting 
>  python as one of our standard "systems languages" for internal 
>  application development (yeah!).  One of the issues that's come up is 
>  the problem with apt (deb packages) vs eggs, vs virtual environments.
>  We're probably gonna end up using Pylons or TurboGears for web-based
>  apps, and I've recommended virtualenv, but one of the other developers 
>  has had some "inconsistencies" when mixing systems with python installed 
>  from apt (all our servers are debian or ubuntu based) vs when installed 
>  under virtualenv.
> 
>  I have basically recommended that we only install the python base (core 
>  language) from apt, and that everything else should be installed into 
>  virtual environments. But I wanted to check to see how other enterprises
>  are handling this issue?  Are you building python from scratch, or using 
>  specific sets of .deb packages, or some other process.
> 
>  Any insight into the best way to have a consistent, repeatable, 
>  controllable development and production environment would be much 
>  appreciated.

I'll admit to not knowing what you mean by virtual environment...

In our debian systems we use python from apt and all modules from apt.

If there is a module we can't find then we build it into a .deb using
setup.py to build an rpm and converting to a .deb.

The app is then tested with "etch" or whatever.

If easy_install could build debs that would be really helpful!

>  Suggestions on build/rollout tools (like zc.buildout, Paver, etc) would 
>  also be appreciated.

Use setup.py to build into .debs is what we do.

-- 
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Re: PEP Proposal

[J Peyret]

On Sep 25, 12:24 pm, [EMAIL PROTECTED] wrote:

> def whoisthethief("List" x):
>   return iknowit(x)
>
> def whoisthethief("String" x, "String" y):
>   return iknowit([x,y])
>

I dunno if this is very Pythonic in nature, but I've done things like
rebinding methods dynamically.

ex:

>>> def test(a):
... return a * 2
...
>>> print test(2)
4
>>> def test2(b):
... return b * 3
...
>>> test = test2
>>> print test(2)
6

In your case

def myNewThiefIdentifier(x,y):
   return "Dunno"

whoisthethief = myNewThiefIdentifier


Which method would this affect (i.e. which 'whoisthethief')?

I assume you could figure it out, given a match on the signature, but
how much work would this require from the developer and the
interpreter?

(apologies in case Google Groups decide to multipost)
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Re: PEP Proposal

[Bruno Desthuilliers]

[EMAIL PROTECTED] a écrit :

Gabriel Genellina wrote:


En Thu, 25 Sep 2008 16:24:58 -0300, <[EMAIL PROTECTED]> escribió:


sorry, I have these ideas for longer than 10 years, please have a look
on it
and comment on it. Thx.

This is another proposal for introducing types into Python.

You got the terminology wrong. Python had "types" from the very start.
You're talking about some kind of generic functions, or an alternative
dispatch method.


Typed parameters.


are unpythonic.


Method-Declaration-filtered-typed parameters.


Philip Eby's RuleDispatch package goes way further, already exists, and 
doesn't require any new syntax.



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