Re: Python3: API Documentation generator

[Chris Rebert]

On Sun, Sep 26, 2010 at 11:56 PM, Tim Diels  wrote:
>  Hi all
>
> I've just switched to python3 and it turns out my current API documentation
> generator (epydoc) no longer works. I am looking for a tool that reads the
> docstrings of all classes, ... in my project and turns it into HTML
> documentation.

Sphinx (http://sphinx.pocoo.org/ ) is the new gold standard. You'll
want to enable the `autodoc` extension:
http://sphinx.pocoo.org/ext/autodoc.html

Cheers,
Chris
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Re: Calling an arbitrary function with the right arguments

[Bruno Desthuilliers]

John O'Hagan a écrit :
How to call a function with the right arguments without knowing in advance 
which function? 


(snip)

For most use case I can think of, I can only second Steven and Chris - 
if your functions are interchangeable then they should have a same API.


Now there's at least one use case I know where you need to dynamically 
select a function then build the right arguments set for it: when 
mapping urls to http request handler functions. There's a good example 
in Django's url to "view" mapping system.

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Re: Calling an arbitrary function with the right arguments

[Peter Otten]

John O'Hagan wrote:

> How to call a function with the right arguments without knowing in advance
> which function? For example:
> 
> import random
> 
> def f1():
> pass
> 
> def f2(foo):
> pass
> 
> def f3(foo, bar):
> pass
> 
> foo=random.choice((1,2,3))
> bar=random.choice((1,2,3))
> 
> myfunc=random.choice((f1, f2, f3))
> 
> How to call myfunc with the right arguments?
> I've been doing it this way:
> 
> f1.args=()
> f2.args=('foo',)
> f3.args=('foo', 'bar')
> 
> args=[vars()[i] for i in myfunc.args]
> 
> myfunc(*args)
> 
> But it seems redundant to manually tag the functions with their own
> arguments' names, and I don't like using vars(). Is there a nicer pattern?

You can use inspect.getargspec() to determine the argument names:

args = [vars()[argname] for argname in inspect.getargspec(myfunc).args]


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Re: Calling an arbitrary function with the right arguments

[Jean-Michel Pichavant]

John O'Hagan wrote:
How to call a function with the right arguments without knowing in advance 
which function? For example:


import random

def f1():
pass

def f2(foo):
pass

def f3(foo, bar):
pass

foo=random.choice((1,2,3))
bar=random.choice((1,2,3))

myfunc=random.choice((f1, f2, f3))

How to call myfunc with the right arguments?
I've been doing it this way:

f1.args=()
f2.args=('foo',)
f3.args=('foo', 'bar')

args=[vars()[i] for i in myfunc.args]

myfunc(*args)

But it seems redundant to manually tag the functions with their own arguments' 
names, and I don't like using vars(). Is there a nicer pattern? 


Regards,

John

  

Hi,

func, args = random.choice(((f1, ()), (f2, (foo,)), (f3, (foo, bar
func(*args)

JM
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check path.exists() with a "converted" path

[Alessandro]

Hi, I'm a python newbie with a problem too hard to tackle.

I have a string defining a path, were all the spaces have been
converted to underscores.
How can I find if it corresponds to a real path?

e.g. a string like '/some/path_to/directory_1/and_to/directory_2'
with a real path: '/some/path_to/directory 1/and_to/directory 2'

notice that the real path can contain BOTH spaces and underscores.

How can I feed it to os.path.exists() ???

thanks
  alessandro
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Re: check path.exists() with a "converted" path

[Chris Rebert]

On Mon, Sep 27, 2010 at 2:23 AM, Alessandro  wrote:
> Hi, I'm a python newbie with a problem too hard to tackle.
>
> I have a string defining a path, were all the spaces have been
> converted to underscores.
> How can I find if it corresponds to a real path?
>
> e.g. a string like '/some/path_to/directory_1/and_to/directory_2'
> with a real path: '/some/path_to/directory 1/and_to/directory 2'
>
> notice that the real path can contain BOTH spaces and underscores.
>
> How can I feed it to os.path.exists() ???

Use the `glob` module instead: http://docs.python.org/library/glob.html

from glob import glob
real_paths = glob(underscored_path.replace('_','[_ ]'))
#note: it's possible for there to be multiple matches

Cheers,
Chris
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problem in Gasp !

[n.a.s]

Hi,

I want to ask about graphics using Gasp .Attached is exercise 10 (houses at
night)  ,if  i
call the draw_house function once it will work properly ,but more than one
call,windows and doors disappear from some houses .

Any one can advice?


Thanks,


house.pyw
Description: Binary data
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Re: check path.exists() with a "converted" path

[Paul Rudin]

Alessandro  writes:

> Hi, I'm a python newbie with a problem too hard to tackle.
>
> I have a string defining a path, were all the spaces have been
> converted to underscores.
> How can I find if it corresponds to a real path?
>
> e.g. a string like '/some/path_to/directory_1/and_to/directory_2'
> with a real path: '/some/path_to/directory 1/and_to/directory 2'
>
> notice that the real path can contain BOTH spaces and underscores.
>
> How can I feed it to os.path.exists() ???

If you just have the converted string then you can't know what the
original string is, you have no way of knowing which underscores were
actually underscores in the original and which where spaces. 

You could generate all possible candidate original strings and check for
file existence, but in general there are many different original strings
that will yield the same converted string, possibly more than one of
those corresponds to a file that exists.





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Re: check path.exists() with a "converted" path

[Raphaël Plasson]

On Sep 27, 6:23 pm, Alessandro  wrote:

>
> I have a string defining a path, were all the spaces have been
> converted to underscores.
>
(...)
>
> notice that the real path can contain BOTH spaces and underscores.
>
> How can I feed it to os.path.exists() ???


You are losing some information, there is no other choice to test all
the combinations.
Something like this should do the trick (/!\ quick and dirty
solution /!\)

def testpath(path):
tmp=path.split("_")
for i in range(2**(len(tmp)-1)):
res=""
for j in range(len(tmp)):
if j>0:
if (i & 2**(j-1))==0:
res += " "
else:
res += "_"
res+=tmp[j]
if os.path.exists(res):
return True
return False

Raphael

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Re: check path.exists() with a "converted" path

[Peter Otten]

Alessandro wrote:

> Hi, I'm a python newbie with a problem too hard to tackle.
> 
> I have a string defining a path, were all the spaces have been
> converted to underscores.
> How can I find if it corresponds to a real path?
> 
> e.g. a string like '/some/path_to/directory_1/and_to/directory_2'
> with a real path: '/some/path_to/directory 1/and_to/directory 2'
> 
> notice that the real path can contain BOTH spaces and underscores.
> 
> How can I feed it to os.path.exists() ???

$ mkdir -p aa{\ ,_}aa/bb{\ ,_}b{\ ,_}/c\ c
$ tree
.
|-- aa aa
|   |-- bb b
|   |   `-- c c
|   |-- bb b_
|   |   `-- c c
|   |-- bb_b
|   |   `-- c c
|   `-- bb_b_
|   `-- c c
`-- aa_aa
|-- bb b
|   `-- c c
|-- bb b_
|   `-- c c
|-- bb_b
|   `-- c c
`-- bb_b_
`-- c c

18 directories, 0 files
$ python
Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import glob
>>> path = "aa_aa/bb_b_/c_c"
>>> glob.glob(path.replace("_", "[_ ]"))
['aa_aa/bb b_/c c', 'aa_aa/bb_b /c c', 'aa_aa/bb b /c c', 'aa_aa/bb_b_/c c', 
'aa aa/bb b_/c c', 'aa aa/bb_b /c c', 'aa aa/bb b /c c', 'aa aa/bb_b_/c c']

I didn't want to throw away my demo just because your question was already 
anwered ;)

Peter
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Re: check path.exists() with a "converted" path

[Alessandro]

people, you're great - best newsgroup I've ever been!

I think I'll go with the glob suggestion - works like a charm!!!

thank you...


alessandro
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Re: Too much code - slicing

[Antoon Pardon]

On Thu, Sep 23, 2010 at 12:23:22AM +, Steven D'Aprano wrote:
> On Tue, 21 Sep 2010 16:17:48 +0200, Antoon Pardon wrote:
> 
> > On Tue, Sep 21, 2010 at 12:07:07AM +, Steven D'Aprano wrote:
> >> On Mon, 20 Sep 2010 19:28:49 +0200, Antoon Pardon wrote:
> >> 
> >> > Not necessarily. Some of us have the impression that Guido
> >> > deliberatly chose an ugly format for the ternary operator.
> >> 
> >> If he did, then he must have changed his mind, because there is nothing
> >> ugly about the ternary operator we ended up with.
> > 
> > That is a question of taste 
> 
> Yes, it certainly is. Describing it as "an ugly format" is also a matter 
> of taste -- taste which in my opinion simply isn't justified by anything 
> other than familiarity.

There is the facts that it broke familiarity with a common pattern.

> > This form only ranked fourth (or maybe third), with the first three all
> > wanting ar structure with the elelement is this order: condition, true
> > case, false case
> > 
> >> > Guido has alwasys been
> >> > against a ternary operator but the requests kept coming. So
> >> > eventually he introduced one. But the impression is that he chose an
> >> > ugly format in the hope of discouraging people to use it.
> >> 
> >> That's sheer and unadulterated nonsense. The fact is that Guido changed
> >> his mind about ternary if after discovering that the work-around
> >> 
> >> true-clause and condition or false-clause
> >> 
> >> is buggy -- it gives the wrong answer if true-clause happens to be a
> >> false value like [], 0 or None. If I recall correctly, the bug bit
> >> Guido himself.
> > 
> > Nonsense. That the work around was buggy was known years before the
> > ternary operator was finally introduced.
> 
> But people kept forgetting it, and it bit the right person one time too 
> many.

So? That it took years between the knowledge that the work-around failed
and a ternary operator finally appearing is still a fact. Which casts doubts
that is was this knowledge that made him change his mind.

> > The introduction of list
> > comprehension made a ternary operator that more usefull but every time
> > it came up the supporters of Guido, told us we just had to define a
> > function if we wanted the items to depend on a condition.
> 
> A function can't do the job, because it isn't lazy:
> 
> def ifte(condition, x, y):
> if condition: return x
> else: return y
> 
> n = 0
> ifte(n != 0, 100/n, -1)
> 
> will fail. This was perhaps *the* killer argument for a ternary-if 
> operator.

You really don't seem to remember what happened then.

Someone would come with a problem that we can now solve as follows.

ls = [ el / 2 if el % 2 == 0 else 3 * el + 1 for el in ls ]

and the respons would be that we just needed to write is as follows:

def f(el):
  if el % 2 == 0:
return el / 2
  else:
return 3 * el + 1

ls = [ f(el) for el in ls ]

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Plone Conference 2010 schedule published

[Matt Hamilton]

Over 400 attendees are set to meet at the 8th annual Plone Conference
for a week-long programme of training, talks and developer sprints
from the 25th to 31st October at the Thistle Grand Hotel in Bristol,
UK.

Plone Conference 2010 registrations are open.

Plone, an Open Source Content Management System used throughout the
world has a massive following and Plone events are held around the
globe. The largest of these is the annual Plone Conference and this
year will be held in the UK. Plone is used for developing websites,
intranet and portals for corporations, NGOs and the public sector.

Organised by Netsight Internet Solutions, it promises to bring
together developers, designers, end users and business people. This
year an additional event is being planned as a one-day mini-conference
on the 26th October called "Plone in Business" which will be aimed
specifically at analysts, advisors, evaluators and information
professionals looking to find out more about Plone and see a showcase
of successful Plone projects from across the sectors. It will also see
the launch of the JBoye Plone Community of Practice.

The main part of the conference, from the 27th - 29th October, has
over 50 scheduled talks from speakers from 19 countries and includes
an 'unconference' day in which talks will be proposed by the
attendees. 

Plone Conference 2010 scheduled talks include:

* Easier and faster Plone theming with Deliverance
* Design and Development with Dexterity
* Enterprise Search in Plone with Solr
* Boosting productivity with "Plone-driven Plone development"
* Brasil.gov.br: Building a digital nation with Plone

Alan Runyan, co-founder of Plone and president of Enfold Systems along
with Alex Limi, fellow co-founder of Plone and now Firefox User
Experience Lead at Mozilla will be delivering a keynote. There will
also be a guest keynote by Richard Noble, OBE, project director of the
Bloodhound SSC project attempting be build a car to pass the 1,000mph
land speed mark.

The conference falls at a great time, with the recent release of Plone
4, a product that raises the bar in the Content Management System
market with a faster, more user-friendly and more refined version of
the product.

So far, registrations for the conference have come from over 30
countries around the world. To find out more about the conference and
to register, visit http://ploneconf2010.org.


-- 
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Netsight Internet Solutions, Ltd.  Business Vision on the Internet
http://www.netsight.co.uk   +44 (0)117 9090901
Web Design | Zope/Plone Development and Consulting | Co-location | Hosting


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possible circular import problem with python-3, but not python-2

[Darren Dale]

I am attempting to contribute to the h5py project by porting the code
for python-3. The code is available in a branch at github:
http://github.com/darrendale/h5py/tree/py3k . That code uses cython to
wrap the hdf5 library.

So far, only a few minor changes have been needed (relative imports,
changes concerning strings/bytes), and I have been able to generate
the c sources, build and install h5py for py3k. But I can't actually
import the library. On Snow Leopard, using the python-3 installed via
MacPorts:

>>> import h5py
Traceback (most recent call last):
  File "", line 1, in 
  File "/Users/darren/.local/lib/python3.1/site-packages/
h5py-1.3.1.dev-py3.1-macosx-10.6-x86_64.egg/h5py/__init__.py", line
34, in 
from . import h5, h5a, h5d, h5f, h5fd, h5g, h5l, h5o, h5i, h5p,
h5r, h5s, h5t, h5z
  File "h5t.pxd", line 17, in init h5py.h5a (h5py/h5a.c:5248)
  File "h5p.pxd", line 23, in init h5py.h5t (h5py/h5t.c:16481)
  File "h5t.pxd", line 17, in init h5py.h5p (h5py/h5p.c:9297)
ImportError: No module named h5t

That looks like it might be a circular import problem, but it works
fine with python-2.6. I'm at a loss on how to proceed, could anyone
please offer a suggestion?

Thanks,
Darren
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Re: Errors with PyPdf

[flebber]

On Sep 27, 2:46 pm, Dave Angel  wrote:
> On 2:59 PM, flebber wrote:
>
> > 
> > Traceback (most recent call last):
> >    File "C:/Python26/Pdfread", line 16, in
> >      open('x.txt', 'w').write(content)
> > NameError: name 'content' is not defined
> > When i use.
>
> > import pyPdf
>
> > def getPDFContent(path):
> >      content =C:\Components-of-Dot-NET.txt"
> >      # Load PDF into pyPDF
> >      pdf =yPdf.PdfFileReader(file(path, "rb"))
> >      # Iterate pages
> >      for i in range(0, pdf.getNumPages()):
> >          # Extract text from page and add to content
> >          content +=df.getPage(i).extractText() + "\n"
> >      # Collapse whitespace
> >      content = ".join(content.replace(u"\xa0", " ").strip().split())
> >      return content
>
> > print getPDFContent(r"C:\Components-of-Dot-NET.pdf").encode("ascii",
> > "ignore")
> > open('x.txt', 'w').write(content)
>
> There's no global variable content, that was local to the function.  So
> it's lost when the function exits.  it does return the value, but you
> give it to print, and don't save it anywhere.
>
> data = getPDFContent(r"C:\Components-of-Dot-NET.pdf").encode("ascii",
> "ignore")
>
> outfile = open('x.txt', 'w')
> outfile.write(data)
>
> close(outfile)
>
> I used a different name to emphasize that this is *not* the same
> variable as content inside the function.  In this case, it happens to
> have the same value.  And if you used the same name, you could be
> confused about which is which.
>
> DaveA

Thank You everyone.
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Re: Raw Sockets - IP-Encapsulation

[Alexander Gattin]

Hello,

On Fri, Sep 24, 2010 at 04:51:01PM +0100, Nobody
wrote:
> On Thu, 23 Sep 2010 21:41:19 +0200, Matthias
> Guentert wrote:
> > I would like to create an IP tunnel using the
> > IP protocol type 4 (socket.IPPROTO_IPIP) on a
> > Linux host. (I also would be happy if I could
> > create a GRE tunnel)
> > 
> > The thing is, I just don't understand how I
> > such a socket could be created and then later
> > on handled.
> 
> You don't create sockets for IPPROTO_IPIP or
> IPPROTO_GRE.  Outside of the kernel, those
> identifiers are only likely to be used for
> specifying protocols when e.g. configuring
> packet filtering.
> 
> Tunnelling only involves user-space for
> configuration.

For GRE/IPIP this is true, but with /dev/tun
and /dev/tap tunnels it isn't -- userspace
program actually reads from/writes to tun/tap
device file descriptor.

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minimal D: need software testers

[Kruptein]

Hey,

I've released the second alpha for minimal-D a program I've written in
python which should make developing easier.
I need people to test the app on bugs and give ideas.

It is written in python using the wxPython toolkit and is linux-only.
(using on windows is on own risk)

You can download a .deb or a .tar.gz from http://launchpad.net/minimal
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reduced-tagged (was Re: toy list processing problem: collect similar terms)

[Mirko]

On Sep 26, 12:05 am, Xah Lee  wrote:

I am hijacking the following post and driving it to Cuba (the Monthy
Python fans will know what I refer to).  I want to create a `reduce'-
like function that can handle similar problems.

Xah said:
> here's a interesting toy list processing problem.
>
> I have a list of lists, where each sublist is labelled by
> a number. I need to collect together the contents of all sublists
> sharing
> the same label. So if I have the list
>
> ((0 a b) (1 c d) (2 e f) (3 g h) (1 i j) (2 k l) (4 m n) (2 o p) (4 q
> r) (5 s t))
>
> where the first element of each sublist is the label, I need to
> produce:
>
> output:
> ((a b) (c d i j) (e f k l o p) (g h) (m n q r) (s t))
>
> stuffed deleted.

Here is my Common Lisp (and I only care about Common Lisp answers)
attempt to create a `reduce'-like function to handle this kind of a
problem (you will see that I am still struggling with the code and the
documentation).

(defun reduce-tagged (function sequence &key
 (key-tag #'first)
 (key-datum #'rest))
  "Use a binary operation, `function' to combine a sequence of tagged
elements.  like-tagged elements are `reduce'd according to `function'
and returned in a list ...

`sequence' is a sequence of tagged elements.  reduce-m will reduce
like-tagged-elements.

If `key-tag' is supplied it is used to extract the element tag.  If
`key-tag' is not supplied, the function `first' is used.

If `key-datum' is supplied, it is used to extract the element datum.
If `key-datum' is not supplied, the function `rest' is used.

"
  (let ((hash (make-hash-table)))
(dolist (datum sequence)
  (let ((tag (funcall key-tag datum))
(values (funcall key-datum datum)))
(multiple-value-bind (it present)
(gethash tag hash)
  (if present
  (setf (gethash tag hash)
(apply function (gethash tag hash) values))
  (setf (gethash tag hash) values)
(let (result)
  (dohash (key value hash)
(push (list key value) result))
  result)))

Comments, improvements?  I am looking for a general purpose function
like reduce that I
can apply in various situations.

Thanks,

Mirko
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Re: reduce-tagged (was Re: toy list processing problem: collect similar terms)

[Mirko]

On Sep 27, 11:18 am, Mirko  wrote:
> On Sep 26, 12:05 am, Xah Lee  wrote:
>
> I am hijacking the following post and driving it to Cuba (the Monthy
> Python fans will know what I refer to).  I want to create a `reduce'-
> like function that can handle similar problems.
>
> Xah said:
>
>
>
> > here's a interesting toy list processing problem.
>
> > I have a list of lists, where each sublist is labelled by
> > a number. I need to collect together the contents of all sublists
> > sharing
> > the same label. So if I have the list
>
> > ((0 a b) (1 c d) (2 e f) (3 g h) (1 i j) (2 k l) (4 m n) (2 o p) (4 q
> > r) (5 s t))
>
> > where the first element of each sublist is the label, I need to
> > produce:
>
> > output:
> > ((a b) (c d i j) (e f k l o p) (g h) (m n q r) (s t))
>
> > stuffed deleted.
>
> Here is my Common Lisp (and I only care about Common Lisp answers)
> attempt to create a `reduce'-like function to handle this kind of a
> problem (you will see that I am still struggling with the code and the
> documentation).
>
> (defun reduce-tagged (function sequence &key
>                  (key-tag #'first)
>                  (key-datum #'rest))
>   "Use a binary operation, `function' to combine a sequence of tagged
> elements.  like-tagged elements are `reduce'd according to `function'
> and returned in a list ...
>
> `sequence' is a sequence of tagged elements.  reduce-m will reduce
> like-tagged-elements.
>
> If `key-tag' is supplied it is used to extract the element tag.  If
> `key-tag' is not supplied, the function `first' is used.
>
> If `key-datum' is supplied, it is used to extract the element datum.
> If `key-datum' is not supplied, the function `rest' is used.
>
> "
>   (let ((hash (make-hash-table)))
>     (dolist (datum sequence)
>       (let ((tag (funcall key-tag datum))
>             (values (funcall key-datum datum)))
>         (multiple-value-bind (it present)
>             (gethash tag hash)
>           (if present
>               (setf (gethash tag hash)
>                     (apply function (gethash tag hash) values))
>               (setf (gethash tag hash) values)
>     (let (result)
>       (dohash (key value hash)
>         (push (list key value) result))
>       result)))
>
> Comments, improvements?  I am looking for a general purpose function
> like reduce that I
> can apply in various situations.
>
> Thanks,
>
> Mirko

Correction: the previous code used a non-portable clisp macro
`dohash' (looks nice, doesn't it?)

Here is the version with maphash:

(defun reduce-tagged (function sequence &key
 (key-tag #'first)
 (key-datum #'rest))
  "Use a binary operation, `function' to combine a sequence of tagged
elements.  like-tagged elements are `reduce'd according to `function'

`sequence' is a sequence of tagged elements.  reduce-m will reduce
like-tagged-elements.

If `key-tag' is supplied it is used to extract the element tag.  If
`key-tag' is not supplied, the function `first' is used.

If `key-datum' is supplied, it is used to extract the element datum.
If `key-datum' is not supplied, the function `rest' is used.

"
  (let ((hash (make-hash-table)))
(dolist (datum sequence)
  (let ((tag (funcall key-tag datum))
(values (funcall key-datum datum)))
(multiple-value-bind (it present)
(gethash tag hash)
  (declare (ignore it))
  (if present
  (setf (gethash tag hash)
(apply function (gethash tag hash) values))
  (setf (gethash tag hash) values)
(let (result)
  (maphash #'(lambda(key value)
   (push (list key value) result))
   hash)
  result)))

Mirko
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Introducing Kids to Programming: 2 or 3?

[Marco Gallotta]

Hi there

I'm sure you get a lot of "2 or 3" questions, but here's another.
Umonya [1] uses Python to introduce school kids to programming. The
initiative is only 15 months old and up till now we've been using
existing notes and exercises and thus Python 2. But we're at the stage
where we can either stick with 2 for the next few years, or go to 3
now.

We received a grant from Google to reach 1,000 kids in South Africa
with our course in 2011. People have also shown interest in running
the course in Croatia, Poland and Egypt. We're also eyeing developing
African countries in the long-term. As such, we're taking the time now
to write our very own specialised course notes and exercises, and we
this is why we need to decide *now* which path to take: 2 or 3? As we
will be translating the notes we'll probably stick with out choice for
the next few years.

Since these are kids, we feel the nice changes in 3 such as removing
integer division will help in teaching. It will also remove confusion
when they go to download Python and grab the latest version. Since
they're just starting, chances are almost none will be hit by the
limited library support for at least a year or two. They will,
however, be hit by the confusion of seeing Python 2 code all over the
web.

We're tending towards 3, but I am a little cautious myself.

Marco

[1] http://umonya.co.za

-- 
Marco Gallotta
MSc Student
Department of Computer Science, University of Cape Town
people.cs.uct.ac.za/~mgallott | marco-za.blogspot.com
marco AT gallotta DOT co DOT za | 073 170  | 021 552 2731
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Re: reduce-tagged (was Re: toy list processing problem: collect similar terms)

[Mirko]

On Sep 27, 11:40 am, Mirko  wrote:
> On Sep 27, 11:18 am, Mirko  wrote:
>
>
>
> > On Sep 26, 12:05 am, Xah Lee  wrote:
>
> > I am hijacking the following post and driving it to Cuba (the Monthy
> > Python fans will know what I refer to).  I want to create a `reduce'-
> > like function that can handle similar problems.
>
> > Xah said:
>
> > > here's a interesting toy list processing problem.
>
> > > I have a list of lists, where each sublist is labelled by
> > > a number. I need to collect together the contents of all sublists
> > > sharing
> > > the same label. So if I have the list
>
> > > ((0 a b) (1 c d) (2 e f) (3 g h) (1 i j) (2 k l) (4 m n) (2 o p) (4 q
> > > r) (5 s t))
>
> > > where the first element of each sublist is the label, I need to
> > > produce:
>
> > > output:
> > > ((a b) (c d i j) (e f k l o p) (g h) (m n q r) (s t))
>
> > > stuffed deleted.
>
> > Here is my Common Lisp (and I only care about Common Lisp answers)
> > attempt to create a `reduce'-like function to handle this kind of a
> > problem (you will see that I am still struggling with the code and the
> > documentation).
>
> ... faulty code deleted

Aaand one more fix (apply -> funcall)  (This version at least produces
a close
facsimile of the desired output)

(defun reduce-tagged (function sequence &key
 (key-tag #'first)
 (key-datum #'rest))
  "Use a binary operation, `function' to combine a sequence of tagged
elements.  like-tagged elements are `reduce'd according to `function'

`sequence' is a sequence of tagged elements.  reduce-m will reduce
like-tagged-elements.

If `key-tag' is supplied it is used to extract the element tag.  If
`key-tag' is not supplied, the function `first' is used.

If `key-datum' is supplied, it is used to extract the element datum.
If `key-datum' is not supplied, the function `rest' is used.

"
  (let ((hash (make-hash-table)))
(dolist (datum sequence)
  (let ((tag (funcall key-tag datum))
(values (funcall key-datum datum)))
(multiple-value-bind (it present)
(gethash tag hash)
  (declare (ignore it))
  (if present
  (setf (gethash tag hash)
(funcall function (gethash tag hash) values))
  (setf (gethash tag hash) values)
(let (result)
  (maphash #'(lambda(key value)
   (push (list key value) result))
   hash)
  result)))
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Re: Introducing Kids to Programming: 2 or 3?

[Andreas Waldenburger]

On Mon, 27 Sep 2010 17:48:06 +0200 Marco Gallotta
 wrote:

> Since these are kids, we feel the nice changes in 3 such as removing
> integer division will help in teaching. It will also remove confusion
> when they go to download Python and grab the latest version. Since
> they're just starting, chances are almost none will be hit by the
> limited library support for at least a year or two.

That's your answer right there.


> They will, however, be hit by the confusion of seeing Python 2 code
> all over the web.

Good point. Here is may suggestion: Make the kids aware of the 2/3
issue as early as possible, but don't go into detail. Maybe start with
the obligatory "Hello world" program, and a few other simple things.
Then, when you get to the "how do help myself on the net" part of the
course (you're including that, right?), you make strong distinction
between Py2 and Py3 and tell them to make absolutely certain that it's
Python 3 code they're looking at. Maybe give the "print()" syntax as a
hint, but have them rely on more explicit descriptions that come with
the code. Later on (once they know more programming constructs to
appreciate the differences), include another lecture, specifically on
the difference between Python 2 and Python 3.

Disclaimer: I'm not an educator. Maybe this is horrible advice. Someone
with a better understanding of kids' and learner's minds please debunk
any nonsense I may have spouted here. I just like to go by the general
rule that, unlike adults, most kids aren't idiots.

/W

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Konya - Turkish Company Directory - NEW ! - Seyfi Suna www.een.kso.org.tr

[Seyfi Suna]

Konya - Turkish Company Directory - NEW ! - Seyfi Suna www.een.kso.org.tr
http://www.een.kso.org.tr/en/konya-firma-rehberi/
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Re: Python3: API Documentation generator

[Tim Diels]

On 27/09/2010 09:02, Chris Rebert wrote:

On Sun, Sep 26, 2010 at 11:56 PM, Tim Diels  wrote:

  Hi all

I've just switched to python3 and it turns out my current API documentation
generator (epydoc) no longer works. I am looking for a tool that reads the
docstrings of all classes, ... in my project and turns it into HTML
documentation.


Sphinx (http://sphinx.pocoo.org/ ) is the new gold standard. You'll
want to enable the `autodoc` extension:
http://sphinx.pocoo.org/ext/autodoc.html

Cheers,
Chris
--
http://blog.rebertia.com


I tried, but it fails to run through python code that's not backwards 
compatible with older python versions.


It fails with: ...autodoc can't import/find module 'pytilities', it 
reported error: "invalid syntax (overload.py, line 55)"...


This is line 55 (runs in python3, not in python):
def process_args(self, *args, kwargs={})

Greetings

Tim (limyreth)
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Re: "Strong typing vs. strong testing"

[namekuseijin]

On 27 set, 05:46, TheFlyingDutchman  wrote:
> On Sep 27, 12:58 am, p...@informatimago.com (Pascal J. Bourguignon)
> wrote:
> > RG  writes:
> > > In article
> > > <7df0eb06-9be1-4c9c-8057-e9fdb7f0b...@q16g2000prf.googlegroups.com>,
> > >  TheFlyingDutchman  wrote:
>
> > >> On Sep 22, 10:26 pm, "Scott L. Burson"  wrote:
> > >> > This might have been mentioned here before, but I just came across it: 
> > >> > a
> > >> > 2003 essay by Bruce Eckel on how reliable systems can get built in
> > >> > dynamically-typed languages.  It echoes things we've all said here, but
> > >> > I think it's interesting because it describes a conversion experience:
> > >> > Eckel started out in the strong-typing camp and was won over.
>
> > >> >    https://docs.google.com/View?id=dcsvntt2_25wpjvbbhk
>
> > >> > -- Scott
>
> > >> If you are writing a function to determine the maximum of two numbers
> > >> passed as arguents in a dynamic typed language, what is the normal
> > >> procedure used by Eckel and others to handle someone passing in
> > >> invalid values - such as a file handle for one varible and an array
> > >> for the other?
>
> > > The normal procedure is to hit such a person over the head with a stick
> > > and shout "FOO".
>
> > Moreover, the functions returning the maximum may be able to work on
> > non-numbers, as long as they're comparable.  What's more, there are
> > numbers that are NOT comparable by the operator you're thinking about!.
>
> > So to implement your specifications, that function would have to be
> > implemented for example as:
>
> > (defmethod lessp ((x real) (y real)) (< x y))
> > (defmethod lessp ((x complex) (y complex))
> >   (or (< (real-part x) (real-part y))
> >       (and (= (real-part x) (real-part y))
> >            (< (imag-part x) (imag-part y)
>
> > (defun maximum (a b)
> >   (if (lessp a b) b a))
>
> > And then the client of that function could very well add methods:
>
> > (defmethod lessp ((x symbol) (y t)) (lessp (string x) y))
> > (defmethod lessp ((x t) (y symbol)) (lessp x (string y)))
> > (defmethod lessp ((x string) (y string)) (string< x y))
>
> > and call:
>
> > (maximum 'hello "WORLD") --> "WORLD"
>
> > and who are you to forbid it!?
>
> > --
> > __Pascal Bourguignon__                    
> > http://www.informatimago.com/-Hide quoted text -
>
> > - Show quoted text -
>
> in C I can have a function maximum(int a, int b) that will always
> work. Never blow up, and never give an invalid answer. If someone
> tries to call it incorrectly it is a compile error.
> In a dynamic typed language maximum(a, b) can be called with incorrect
> datatypes. Even if I make it so it can handle many types as you did
> above, it could still be inadvertantly called with a file handle for a
> parameter or some other type not provided for. So does Eckel and
> others, when they are writing their dynamically typed code advocate
> just letting the function blow up or give a bogus answer, or do they
> check for valid types passed? If they are checking for valid types it
> would seem that any benefits gained by not specifying type are lost by
> checking for type. And if they don't check for type it would seem that
> their code's error handling is poor.

that is a lie.

Compilation only makes sure that values provided at compilation-time
are of the right datatype.

What happens though is that in the real world, pretty much all
computation depends on user provided values at runtime.  See where are
we heading?

this works at compilation time without warnings:
int m=numbermax( 2, 6 );

this too:
int a, b, m;
scanf( "%d", &a );
scanf( "%d", &b );
m=numbermax( a, b );

no compiler issues, but will not work just as much as in python if
user provides "foo" and "bar" for a and b... fail.

What you do if you're feeling insecure and paranoid?  Just what
dynamically typed languages do:  add runtime checks.  Unit tests are
great to assert those.

Fact is:  almost all user data from the external words comes into
programs as strings.  No typesystem or compiler handles this fact all
that graceful...
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relative imports and sub-module execution

[King]

Hi,

After reading couple of docs and articles, I have implemented a simple
test package with nested modules.
When running "main.py", everything is working fine. Some of my sub-
modules has some small test routines for debug purpose.
It's because I am using relative package imports at the top, I am not
able to run these sub modules individually.

For example, this works when running from main.py

Here is example structure

main.py
__init__.py
core/
__init__.py
   folder1
__init__.py
   f1a.py
   f1b.py
folder2
__init__.py
   f2a.py
   f2b.py

in folder2/f2b.py, I am importing

from core.folder1 import f1a
print f1a.myvar

Now I can't execute 'f2b.py' individually. It's giving an error:

ImportError: No module named core.folder2

Is this mean when you have created a package where modules are using
relative imports, they can't execute individually?

Another solution that I have discovered is using sys.path. Check this:

import sys
import os
sys.path.append(os.path.abspath("../../"))
from core.folder1 import f1a
print f1a.myvar

This works fine and easier too. I can execute modules individually as
well as package is also working. Are there any disadvantages when
using above technique? Couple of articles suggests that this is a bad
practice and should not be used.

Need some clarifications.

Thanks

Prashant


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Re: Introducing Kids to Programming: 2 or 3?

[Terry Reedy]

On 9/27/2010 11:48 AM, Marco Gallotta wrote:

Hi there

I'm sure you get a lot of "2 or 3" questions, but here's another.
Umonya [1] uses Python to introduce school kids to programming. The
initiative is only 15 months old and up till now we've been using
existing notes and exercises and thus Python 2. But we're at the stage
where we can either stick with 2 for the next few years, or go to 3
now.

We received a grant from Google to reach 1,000 kids in South Africa
with our course in 2011. People have also shown interest in running
the course in Croatia, Poland and Egypt. We're also eyeing developing
African countries in the long-term. As such, we're taking the time now
to write our very own specialised course notes and exercises, and we
this is why we need to decide *now* which path to take: 2 or 3? As we
will be translating the notes we'll probably stick with out choice for
the next few years.


I would absolutely, definitely, move to Python3, with the the intention 
of using 3.2 when it comes out in a few months. I suspect that most of 
your exercise code will need little change beyond what 2to3 does for you.



Since these are kids, we feel the nice changes in 3 such as removing
integer division will help in teaching.


There are several half-finished transitions in late 2.x. Removal of 
old-style classes, not only as the default, but completely, removes a 
source of confusion. The range/xrange confusion is gone. The 
input/raw_imput confusion is gome. I think most important for an 
international project is the shift to unicode as the default text type, 
including for identifiers. Kids who are not masters of English will want 
to write identifiers in their own language.


> It will also remove confusion

when they go to download Python and grab the latest version. Since
they're just starting, chances are almost none will be hit by the
limited library support for at least a year or two.


I personally consider this pretty irrelevant for teaching programming to 
kids. There is a *lot* in the stdlib to work with. And stdlib 
improvement is getting special emphasis for 3.2. Bug fixes may be 
backported, feature additions are not.


Even if one disagrees, 3rd-party library support is improving and will 
continue to improve especially after 3.2 is released. For instance, the 
recent release of numpy for 3.1 enables conversions that were blocked 
waiting for that.

http://sourceforge.net/projects/numpy/files/NumPy/1.5.0/numpy-1.5.0-win32-superpack-python3.1.exe/download

For another example, the web-sig appears to have agreed on a minimal, 
backward-compatible extension to PEP 333 to make wsgi work with Python3. 
This will be PEP . (It appears the problem was too many choices 
rather than no choice. Discussion continues on more extensive 
non-compatible changes.) This will allow existing wsgi tools to both 
work with Python3 *and* continue to be intercompatible. (The latter was 
the problem. If each tool made its own non-standard choice for Python3, 
that latter property would be lost.)


--
Terry Jan Reedy

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Re: Python3: API Documentation generator

[Terry Reedy]

On 9/27/2010 1:15 PM, Tim Diels wrote:

On 27/09/2010 09:02, Chris Rebert wrote:

On Sun, Sep 26, 2010 at 11:56 PM, Tim Diels wrote:

Hi all

I've just switched to python3 and it turns out my current API
documentation
generator (epydoc) no longer works. I am looking for a tool that
reads the
docstrings of all classes, ... in my project and turns it into HTML
documentation.


Sphinx (http://sphinx.pocoo.org/ ) is the new gold standard. You'll
want to enable the `autodoc` extension:
http://sphinx.pocoo.org/ext/autodoc.html

Cheers,
Chris
--
http://blog.rebertia.com


I tried, but it fails to run through python code that's not backwards
compatible with older python versions.

It fails with: ...autodoc can't import/find module 'pytilities', it
reported error: "invalid syntax (overload.py, line 55)"...

This is line 55 (runs in python3, not in python):
def process_args(self, *args, kwargs={})


Unless the autodoc doc says that it does not work with all Python3 code, 
that strikes me as a bug (a new 3.x feature that was overlooked) that 
should be reported. The sphinx tracker is linked on the sphinx homepage

http://bitbucket.org/birkenfeld/sphinx/issues/
There is also a link to a google group for sphinx.


Does epydoc not work because is does not run on 3.1 or because it also 
chokes when fed the above code.


In the meanwhile, you could change the api ;-).

--
Terry Jan Reedy

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Re: Python3: API Documentation generator

[Ken Watford]

On Mon, Sep 27, 2010 at 1:15 PM, Tim Diels  wrote:
> On 27/09/2010 09:02, Chris Rebert wrote:
>>
>> On Sun, Sep 26, 2010 at 11:56 PM, Tim Diels  wrote:
>>>
>>>  Hi all
>>>
>>> I've just switched to python3 and it turns out my current API
>>> documentation
>>> generator (epydoc) no longer works. I am looking for a tool that reads
>>> the
>>> docstrings of all classes, ... in my project and turns it into HTML
>>> documentation.
>>
>> Sphinx (http://sphinx.pocoo.org/ ) is the new gold standard. You'll
>> want to enable the `autodoc` extension:
>> http://sphinx.pocoo.org/ext/autodoc.html
>>
>> Cheers,
>> Chris
>> --
>> http://blog.rebertia.com
>
> I tried, but it fails to run through python code that's not backwards
> compatible with older python versions.
>
> It fails with: ...autodoc can't import/find module 'pytilities', it reported
> error: "invalid syntax (overload.py, line 55)"...
>
> This is line 55 (runs in python3, not in python):
> def process_args(self, *args, kwargs={})
>

As far as I'm aware, autodoc works by importing the modules and then
reading doctext straight from the __doc__ attributes.
So the module in question has to import correctly in whatever
interpreter Sphinx is using. You probably need to install Sphinx with
python3 to get it to use the right interpreter. If you're using
easy_install or pip, check if you have an easy_install-3.1 or pip-3.1
(or similar) script installed.
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Re: (and scheme lisp) x Python and modern langs [was Re: gossip, Guy Steel, Lojban, Racket]

[Xah Lee]

2010-09-27

> For instance, this is far more convenient:

> [x+1 for x in [1,2,3,4,5] if x%2==0]

> than this:

> map(lambda x:x+1,filter(lambda x:x%2==0,[1,2,3,4,5]))

How about this:

 LC(func, inputList, P)

compared to

 [func for myVar in inputList if P]

the functional form is:

• shorter
• not another idiysyncratic new syntax



now, a separate issue. Suppose we want some “list comprehension”
feature in a functional lang.
Normally, by default this can be done by

 filter( map(func, inputList), Predicate)

but perhaps this usage is so frequent that we want to create a new
fuction for it, to make it more convenient, and perhaps easier to make
the compiler to optimize more. e.g.

 LC(func, inputList, Predicate)

this is about whether a lang should create a new convenient function
that otherwise require 2 function combinations. Common Lisp vs Scheme
Lisp are the typical example of extreme opposites.

note, there's no new syntax involved.



Now, let's consider another separated issue related to so-called “list
comprehension”.
Suppose we decided that generating list by a filter is so frequently
used that it worth it to create a new func for it.

 LC(func, inputList, Predicate)

Now, in functional langs, in general a design principle is that you
want to reduce the number of function unless you really need. Because,
any combination of list related functions could potentionally be a new
function in your lang. So, if we really think LC is useful, we might
want to generalize it. e.g. in

 LC(func, inputList, Predicate)

is it worthwhile say to add a 4th param, that says return just the
first n? (here we presume the lang doesn't support list of infinite
elements) e.g.

 LC(func, inputList, Predicate, n)

what about partition the list to m sublists?

 LC(func, inputList, Predicate, n, m)

what about actualy more generalized partition, by m sublist then by m1
sublist then by m2 sublist?

 LC(func, inputList, Predicate, n, list(m,m1,m2,...))

what about sorting? maybe that's always used together when you need a
list?

 LC(func, inputList, Predicate, n, list(m,m1,m2,...), sortPredcate)

what if actually frequently we want LC to map parallel to branches?
e.g.

 LC(func, inputList, Predicate, n, list(m,m1,m2,...), sortPredcate,
mapBranch:True)

what if ...

you see, each of these or combination of these can be done by default
in the lang by sequenceing one or more functions (i.e. composition).
But when we create a new function, we really should think a lot about
its justification, because otherwise the lang becomes a bag of
functions that are non-essential, confusing.

In summary:

• “list comprehension” is a bad jargon.

• The concept of “list comprehension” is redundant. There's no
justification for the concept to exist except historical.

• The syntax of “list comprehension” in most lang is ad hoc syntax.

for those who find imperative lang good, then perhaps “list
comprehension” is good, because it adds another idiosyncratic syntax
to the lang, but such is with the tradition of imperative langs. The
ad hoc syntax aids in reading code by various syntactical forms and
hint words such as “[... for ... in ...]”.

 Xah ∑ xahlee.org ☄
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Re: (and scheme lisp) x Python and modern langs [was Re: gossip, Guy Steel, Lojban, Racket]

[namekuseijin]

On 27 set, 16:06, Xah Lee  wrote:
> 2010-09-27
>
> > For instance, this is far more convenient:
> > [x+1 for x in [1,2,3,4,5] if x%2==0]
> > than this:
> > map(lambda x:x+1,filter(lambda x:x%2==0,[1,2,3,4,5]))
>
> How about this:
[snip]

how about this:  read before replying.
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Re: Introducing Kids to Programming: Scratch

[Kee Nethery]

My son has been writing games using MIT's Scratch. It is visual and highly 
interactive. In an afternoon he can build something that looks cool to him, is 
interactive, and that he can share with others. It's not Python but he is 
learning how to make the tools do what he wants and he is getting results. He's 
8 years old.

http://scratch.mit.edu

For introducing kids to programming, I recommend Scratch.

Kee Nethery
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Re: "Strong typing vs. strong testing"

[Pascal J. Bourguignon]

namekuseijin  writes:

>> in C I can have a function maximum(int a, int b) that will always
>> work. Never blow up, and never give an invalid answer. If someone
>> tries to call it incorrectly it is a compile error.
>> In a dynamic typed language maximum(a, b) can be called with incorrect
>> datatypes. Even if I make it so it can handle many types as you did
>> above, it could still be inadvertantly called with a file handle for a
>> parameter or some other type not provided for. So does Eckel and
>> others, when they are writing their dynamically typed code advocate
>> just letting the function blow up or give a bogus answer, or do they
>> check for valid types passed? If they are checking for valid types it
>> would seem that any benefits gained by not specifying type are lost by
>> checking for type. And if they don't check for type it would seem that
>> their code's error handling is poor.
>
> that is a lie.
>
> Compilation only makes sure that values provided at compilation-time
> are of the right datatype.
>
> What happens though is that in the real world, pretty much all
> computation depends on user provided values at runtime.  See where are
> we heading?
>
> this works at compilation time without warnings:
> int m=numbermax( 2, 6 );
>
> this too:
> int a, b, m;
> scanf( "%d", &a );
> scanf( "%d", &b );
> m=numbermax( a, b );
>
> no compiler issues, but will not work just as much as in python if
> user provides "foo" and "bar" for a and b... fail.
>
> What you do if you're feeling insecure and paranoid?  Just what
> dynamically typed languages do:  add runtime checks.  Unit tests are
> great to assert those.
>
> Fact is:  almost all user data from the external words comes into
> programs as strings.  No typesystem or compiler handles this fact all
> that graceful...


I would even go further.

Types are only part of the story.  You may distinguish between integers
and floating points, fine.  But what about distinguishing between
floating points representing lengths and floating points representing
volumes?  Worse, what about distinguishing and converting floating
points representing lengths expressed in feets and floating points
representing lengths expressed in meters.

If you start with the mindset of static type checking, you will consider
that your types are checked and if the types at the interface of two
modules matches you'll think that everything's ok.  And six months later
you Mars mission will crash.

On the other hand, with the dynamic typing mindset, you might even wrap
your values (of whatever numerical type) in a symbolic expression
mentionning the unit and perhaps other meta data, so that when the other
module receives it, it may notice (dynamically) that two values are not
of the same unit, but if compatible, it could (dynamically) convert into
the expected unit.  Mission saved!


-- 
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-- 
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Re: "Strong typing vs. strong testing"

[Scott L. Burson]

Pascal J. Bourguignon wrote:


On the other hand, with the dynamic typing mindset, you might even wrap
your values (of whatever numerical type) in a symbolic expression
mentionning the unit and perhaps other meta data, so that when the other
module receives it, it may notice (dynamically) that two values are not
of the same unit, but if compatible, it could (dynamically) convert into
the expected unit.  Mission saved!


In fairness, you could do this statically too, and without the consing 
required by the dynamic approach.


-- Scott

--
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Re: "Strong typing vs. strong testing"

[Pascal J. Bourguignon]

"Scott L. Burson"  writes:

> Pascal J. Bourguignon wrote:
>>
>> On the other hand, with the dynamic typing mindset, you might even wrap
>> your values (of whatever numerical type) in a symbolic expression
>> mentionning the unit and perhaps other meta data, so that when the other
>> module receives it, it may notice (dynamically) that two values are not
>> of the same unit, but if compatible, it could (dynamically) convert into
>> the expected unit.  Mission saved!
>
> In fairness, you could do this statically too, and without the consing
> required by the dynamic approach.

I don't deny it.  My point is that it's a question of mindset.

-- 
__Pascal Bourguignon__ http://www.informatimago.com/
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Re: toy list processing problem: collect similar terms

[ccc31807]

On Sep 26, 12:05 am, Xah Lee  wrote:
> here's a interesting toy list processing problem.
>
> I have a list of lists, where each sublist is labelled by
> a number. I need to collect together the contents of all sublists
> sharing
> the same label. So if I have the list
>
> ((0 a b) (1 c d) (2 e f) (3 g h) (1 i j) (2 k l) (4 m n) (2 o p) (4 q
> r) (5 s t))
>
> where the first element of each sublist is the label, I need to
> produce:
>
> output:
> ((a b) (c d i j) (e f k l o p) (g h) (m n q r) (s t))

Here is a solution in Perl -- the verbose version. Please see my note
below.

SCRIPT:
use strict;
use warnings;
my %lists;

while ()
{
chomp;
my ($k, @v) = split(/ /, $_);
push(@{$lists{$k}}, @v);
}

foreach my $k (sort keys %lists)
{
print "$k - @{$lists{$k}}\n";
}

exit(0);

__DATA__
0 a b
1 c d
2 e f
3 g h
1 i j
2 k l
4 m n
2 o p
4 q r
5 s t

OUTPUT:
>perl lists.plx
0 - a b
1 - c d i j
2 - e f k l o p
3 - g h
4 - m n q r
5 - s t

NOTE:
I assume that you want an idiomatic solution for the language. I have
therefore converted your data into a typical record oriented
structure. Perlistas don't use parenthesis. If you want a Lispy
solution, use Lisp. Further, Perl was made for exactly this kind of
problem, which is simple data munging, taking some input, transforming
it, and printing it out -- Practical Extraction and Reporting
Language. I know that some Lispers (R.G., are you reading?) will
object to a formulation like this: @{$lists{$k}}, but all this says
(in Perl) is to spit out the value contained in the hash element
$lists{$k} as an array, and is good idiomatic Perl, even if some
Lispers aren't quite up to the task of understanding it.

CC.
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Re: [ctpug] Introducing Kids to Programming: 2 or 3?

[Simon Cross]

On Mon, Sep 27, 2010 at 5:48 PM, Marco Gallotta  wrote:
> We received a grant from Google to reach 1,000 kids in South Africa
> with our course in 2011. People have also shown interest in running
> the course in Croatia, Poland and Egypt. We're also eyeing developing
> African countries in the long-term. As such, we're taking the time now
> to write our very own specialised course notes and exercises, and we
> this is why we need to decide *now* which path to take: 2 or 3? As we
> will be translating the notes we'll probably stick with out choice for
> the next few years.

If you were going to start running the course tomorrow I'd suggest
sticking with Python 2. Python 3 ports are rapidly becoming available
but few have had the bugs shaken out of them yet. In three or four
months I expect that the important bugs will have been dealt with.
Given that 2.x will not receive any new features, I think it is
effectively dead.

I would explicitly mention the existence of 2.7 and 3.2 [1] to
students (perhaps near the end of the first day or whenever they're
about to go off and download Python for themselves).

One caveat is that web applications may only start to migrate to 3.x
late next year. There are a number of reasons for this. First it's not
yet clear what form the WSGI standard will take under Python 3 (and if
3.2 is released before this decision is made it will effectively have
to wait for 3.3 to be included).  Secondly the software stack involved
is quite deep in some places. For example, database support might
require porting MySQLdb, then SQLAlchemy, then the web framework and
only after that the web application itself.

[1] Which should hopefully make it out before 2011. :)

Schiavo
Simon
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Re: (and scheme lisp) x Python and modern langs [was Re: gossip, Guy Steel, Lojban, Racket]

[Xah Lee]

On Sep 27, 12:11 pm, namekuseijin  wrote:
> On 27 set, 16:06, Xah Lee  wrote:> 2010-09-27
>
> > > For instance, this is far more convenient:
> > > [x+1 for x in [1,2,3,4,5] if x%2==0]
> > > than this:
> > > map(lambda x:x+1,filter(lambda x:x%2==0,[1,2,3,4,5]))
>
> > How about this:
>
> [snip]
>
> how about this:  read before replying.

hum???

i read your post quite carefully, and rather thought i replied well.
In fact, i really wanted to tell you “read before replying” before but
refrained from making any of that expression.

here's 2 previous posts about list compre.
http://groups.google.com/group/comp.lang.lisp/msg/145f6ecf29ebbdaf
http://groups.google.com/group/comp.lang.lisp/msg/62ca84062c9fcdca

 Xah
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Re: program organization question for web development with python

[Hans]

On Sep 17, 2:36 am, Bruno Desthuilliers  wrote:
> Hans a écrit :
> (snip)
>
> > Maybe I did not make my question clear. I never tried python web
> > programing before, so I want to start from CGI.
>
> You can indeed learn quite a few things doing raw CGI - the most
> important one being why frameworks are a good idea !-)
>
> > I read something about web framework like django, but seems it's a
> > little bit complicated.
>
> Not that much IMHO, but being an early django user I'm probably a bit
> biased. Now Python is known as "the language with more web frameworks
> than keywords", so you could probably check some lighter framework like
>   web.py (http://webpy.org/) or flask (http://flask.pocoo.org/).
>
> > my task is actually very simple: get search
> > string from input, and then search database, print search result. I
> > thought CGI should be good enough to do this.
>
> CGI is "good enough" to do any web stuff - just like assembler is "good
> enough" to write any application !-)
>
>
>
> > I don't have any idea about how to organize those cgi codes, so what
> > I'm asking is:
>
> > 1. do I have to have each single file for each hyper-link? Can I put
> > them together? how?
>
> > 2. how can I pass a db_cursor to another file?   can I use db_cursor as
> > a parameter?
>
> Obviously not. FWIW, both questions show a lack of understanding of the
> HTTP protocol, and you can't hope to do anything good in web programming
> if you don't understand at least the basics of the HTTP protocol,
> specially the request/response cycle.
>
> Now for a couple more practical answers:
>
> There are basically two ways to organize your url => code mapping:
> 1/ have only one cgi script and use querystring params to tell which
> action should be executed.
> 2/ have one cgi script per action.
>
> The choice is up to you. For a simple app like yours, the first solution
> is probably the most obvious : always display the seach form, if the
> user submitted the form also display the result list. That's how google
> works (wrt/ user interface I mean).
>
> Now if you still need / want to have distinct scripts and want to factor
> out some common code, you just put the common code in a module that you
> import from each script.

Thank you very much! I got your meaning. The choice 1 is definitely
what I want, I just cannot think about this idea by myself. Thank you
again!
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Nautilus Python

[Eduardo Ribeiro]

I'm a python noob and wrote the following code for a nautilus extension:

#!/usr/local/bin/python
# -*- coding: utf-8 -*-

import urllib
import gtk
import pygtk
import nautilus
import gconf 
import gtk.glade

class Slide (nautilus.MenuProvider):
f = None
def __init__(self):
self.client = gconf.client_get_default() 
self.f = gtk.glade.XML( "papel.glade" ) 
self.window = self.f.get_widget("window1")
gtk.main()

def oi (self):
self.window.show()

def menu_activate_cb(self, menu, file):
self.oi()

def get_file_items(self, window,files):
if len(files) != 1:
return
item = 
nautilus.MenuItem('NautilusPython::slide_file_item','Slide','Slide')
item.connect('activate', self.menu_activate_cb, files[0])
return item,

def get_background_items(self, window, file):
 item = nautilus.MenuItem('NautilusPython::slide_item','Slide','Slide')
 item.connect('activate', self.menu_background_activate_cb, file)
 return item, 

def menu_background_activate_cb(self, menu, file):
self.oi()

But it doesn't work. If I comment the lines:

self.f = gtk.glade.XML( "papel.glade" ) 
self.window = self.f.get_widget("window1")
gtk.main()

the code works but I can't see any problem in those lines. Any help?



  

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strange results from sys.version

[John Machin]

I am trying to help a user of my xlrd package who says he is getting 
anomalous results on his "work computer" but not on his "home computer".


Attempts to reproduce his alleged problem in a verifiable manner on his 
"work computer" have failed, so far ... the only meaning difference in 
script output is in sys.version


User (work): sys.version: 2.7 (r27:82500, Aug 23 2010, 17:18:21) etc
Me : sys.version: 2.7 (r27:82525, Jul  4 2010, 09:01:59) etc

I have just now downloaded the Windows x86 msi from www.python.org and 
reinstalled it on another computer. It gives the same result as on my 
primary computer (above).


User result looks whacked: lower patch number, later date. 
www.python.org says "Python 2.7 was released on July 3rd, 2010."


Is it possible that the "work computer" is using an unofficial release? 
What other possibilities are there?


Thanks in advance ...
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Re: strange results from sys.version

[Robert Kern]

On 9/27/10 6:01 PM, John Machin wrote:

I am trying to help a user of my xlrd package who says he is getting anomalous
results on his "work computer" but not on his "home computer".

Attempts to reproduce his alleged problem in a verifiable manner on his "work
computer" have failed, so far ... the only meaning difference in script output
is in sys.version

User (work): sys.version: 2.7 (r27:82500, Aug 23 2010, 17:18:21) etc
Me : sys.version: 2.7 (r27:82525, Jul 4 2010, 09:01:59) etc

I have just now downloaded the Windows x86 msi from www.python.org and
reinstalled it on another computer. It gives the same result as on my primary
computer (above).

User result looks whacked: lower patch number, later date. www.python.org says
"Python 2.7 was released on July 3rd, 2010."

Is it possible that the "work computer" is using an unofficial release? What
other possibilities are there?


ActivePython 2.7.0.2 was released on Aug 25:

http://downloads.activestate.com/ActivePython/releases/2.7.0.2/

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
 that is made terrible by our own mad attempt to interpret it as though it had
 an underlying truth."
  -- Umberto Eco

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Re: strange results from sys.version

[Sridhar Ratnakumar]

On 2010-09-27, at 4:30 PM, Robert Kern wrote:

> On 9/27/10 6:01 PM, John Machin wrote:
>> I am trying to help a user of my xlrd package who says he is getting 
>> anomalous
>> results on his "work computer" but not on his "home computer".
>> 
>> Attempts to reproduce his alleged problem in a verifiable manner on his "work
>> computer" have failed, so far ... the only meaning difference in script 
>> output
>> is in sys.version
>> 
>> User (work): sys.version: 2.7 (r27:82500, Aug 23 2010, 17:18:21) etc
>> Me : sys.version: 2.7 (r27:82525, Jul 4 2010, 09:01:59) etc
>> 
>> I have just now downloaded the Windows x86 msi from www.python.org and
>> reinstalled it on another computer. It gives the same result as on my primary
>> computer (above).
>> 
>> User result looks whacked: lower patch number, later date. www.python.org 
>> says
>> "Python 2.7 was released on July 3rd, 2010."
>> 
>> Is it possible that the "work computer" is using an unofficial release? What
>> other possibilities are there?
> 
> ActivePython 2.7.0.2 was released on Aug 25:
> 
> http://downloads.activestate.com/ActivePython/releases/2.7.0.2/

John,

If it is ActivePython, the first line of the interactive shell (in credits 
section) should print something like:

  ActivePython 2.7.0.2 (ActiveState Software Inc.) 

Also what is the output of "python -m activestate"?

-srid
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Re: strange results from sys.version

[Sridhar Ratnakumar]

On 2010-09-27, at 4:01 PM, John Machin wrote:

> User (work): sys.version: 2.7 (r27:82500, Aug 23 2010, 17:18:21) etc
> Me : sys.version: 2.7 (r27:82525, Jul  4 2010, 09:01:59) etc
> 
> [...] User result looks whacked: lower patch number, later date

Perusing http://svn.python.org/view/python/branches/release27-maint/?view=log - 
the difference in svn versions (there is no difference in patch number) seems 
insignificant. Both revisions are past the 2.7 final release. Perhaps, the 
python.org installer was created using a later revision.

-srid
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Re: (and scheme lisp) x Python and modern langs [was Re: gossip, Guy Steel, Lojban, Racket]

[namekuseijin]

On 27 set, 18:39, Xah Lee  wrote:
> On Sep 27, 12:11 pm, namekuseijin  wrote:
>
> > On 27 set, 16:06, Xah Lee  wrote:> 2010-09-27
>
> > > > For instance, this is far more convenient:
> > > > [x+1 for x in [1,2,3,4,5] if x%2==0]
> > > > than this:
> > > > map(lambda x:x+1,filter(lambda x:x%2==0,[1,2,3,4,5]))
>
> > > How about this:
>
> > [snip]
>
> > how about this:  read before replying.
>
> hum???
>
> i read your post quite carefully, and rather thought i replied well.

I don't think so.  You completely missed the point where I agreed
about filter map being more convenient when calling predefined
functions and also the detailed explanation of why do in scheme is not
imperative at all.
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Re: Debugger - fails to "continue" with breakpoint set

[Danny Levinson]

 Does this describe the problem you are having?

http://bugs.python.org/issue5294

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Re: Problems reading tif files

[gujax]

On Sep 26, 9:19 pm, Christian Heimes  wrote:
> Am 27.09.2010 02:31, schrieb gujax:
>
> > Hi,
> > I have read several related e-mails dating back as far as 2006. I am
> > quite confused whether PIL can open tif images. Some posts seem to say
> > there isn't yet any support for PIL while there are few posts where
> > PIL has been able to open tif images. So I guess, I have to ask this
> > probably trivial question again. I am just learning python and PIL. I
> > have tiff images which are 8 bit and 16 bit gray scale images. I
> > cannot open them. Here are the errors that I encounter.
>
> PIL only supports a limited subset of TIFF files. Several compression
> algorithms like G3 and G4 fax compression are not supported yet. PIL may
> have a problem with partly broken TIFF files, too.
>
> > I have no idea why this happens.
> > I will appreciate a resolution. The file opens with ImageJ and
> > ImageMagick. It is a 8-bit RGB file. I have associated default viewer
> > to be ImageMagick. I am on Lucid Linux, and other programs such as F-
> > spot and Gimp cannot open those files either.
> > I don't yet know how to attach image files to the post so please bear
> > with me till I figure that out.
>
> Can you please post the output of tiffinfo for the specific file? It may
> give me a hint what's going wrong.
>
> There aren't a lot of good alternatives for image processing in Python.
> I've evaluated most of them and decided to write my own one for my
> employer. It's a Cython based library around FreeImage [1] and LCMS2 [2]
> and works very well. So far we have processed several million TIFF files
> with more than 100 TB of raw data smoothly. I've permission to release
> the software as open source but haven't found time to do a proper release.
>
> Christian Heimes
>
> [1]http://freeimage.sourceforge.net/
> [2]http://www.littlecms.com/

Thanks Christian,
Here is the tiffinfo:

TIFF Directory at offset 0x8 (8)
  Subfile Type: (0 = 0x0)
  Image Width: 640 Image Length: 480
  Bits/Sample: 32
  Sample Format: IEEE floating point
  Compression Scheme: None
  Photometric Interpretation: min-is-black
  Samples/Pixel: 1
  Rows/Strip: 480
  Planar Configuration: single image plane
  ImageDescription: ImageJ=1.44f
min=0.0
max=255.0

How do I use freeimage with python. Is there a backend?
Can these files be converted to something else such as bmp and then
read out? I should have tried it out before asking you,
Thanks
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Re: Problems reading tif files

[gujax]

Thanks Christian,
Here is the info:
TIFF Directory at offset 0x8 (8)
  Subfile Type: (0 = 0x0)
  Image Width: 640 Image Length: 480
  Bits/Sample: 32
  Sample Format: IEEE floating point
  Compression Scheme: None
  Photometric Interpretation: min-is-black
  Samples/Pixel: 1
  Rows/Strip: 480
  Planar Configuration: single image plane
  ImageDescription: ImageJ=1.44f
min=0.0
max=255.0

How can I use freeimage. Can I incorporate it with python? Any idea
what do ImageJ or Matlab use. Don't they have a robust imaging
toolbox. Unfortunately, I cannot afford Matlab and I am not good at
Java programing to be able to implement ImageJ with numerical analysis
software.

Thanks much,
gujax



On Sep 26, 9:19 pm, Christian Heimes  wrote:
> Am 27.09.2010 02:31, schrieb gujax:
>
> > Hi,
> > I have read several related e-mails dating back as far as 2006. I am
> > quite confused whether PIL can open tif images. Some posts seem to say
> > there isn't yet any support for PIL while there are few posts where
> > PIL has been able to open tif images. So I guess, I have to ask this
> > probably trivial question again. I am just learning python and PIL. I
> > have tiff images which are 8 bit and 16 bit gray scale images. I
> > cannot open them. Here are the errors that I encounter.
>
> PIL only supports a limited subset of TIFF files. Several compression
> algorithms like G3 and G4 fax compression are not supported yet. PIL may
> have a problem with partly broken TIFF files, too.
>
> > I have no idea why this happens.
> > I will appreciate a resolution. The file opens with ImageJ and
> > ImageMagick. It is a 8-bit RGB file. I have associated default viewer
> > to be ImageMagick. I am on Lucid Linux, and other programs such as F-
> > spot and Gimp cannot open those files either.
> > I don't yet know how to attach image files to the post so please bear
> > with me till I figure that out.
>


> Can you please post the output of tiffinfo for the specific file? It may
> give me a hint what's going wrong.
>
> There aren't a lot of good alternatives for image processing in Python.
> I've evaluated most of them and decided to write my own one for my
> employer. It's a Cython based library around FreeImage [1] and LCMS2 [2]
> and works very well. So far we have processed several million TIFF files
> with more than 100 TB of raw data smoothly. I've permission to release
> the software as open source but haven't found time to do a proper release.
>
> Christian Heimes
>
> [1]http://freeimage.sourceforge.net/
> [2]http://www.littlecms.com/

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Re: "Strong typing vs. strong testing"

[John Nagle]

On 9/27/2010 10:46 AM, namekuseijin wrote:

On 27 set, 05:46, TheFlyingDutchman  wrote:

On Sep 27, 12:58 am, p...@informatimago.com (Pascal J. Bourguignon)
wrote:

RG  writes:

In article
<7df0eb06-9be1-4c9c-8057-e9fdb7f0b...@q16g2000prf.googlegroups.com>,
  TheFlyingDutchman  wrote:



On Sep 22, 10:26 pm, "Scott L. Burson"  wrote:

This might have been mentioned here before, but I just came across it: a
2003 essay by Bruce Eckel on how reliable systems can get built in
dynamically-typed languages.  It echoes things we've all said here, but
I think it's interesting because it describes a conversion experience:
Eckel started out in the strong-typing camp and was won over.



https://docs.google.com/View?id=dcsvntt2_25wpjvbbhk




   The trouble with that essay is that he's comparing with C++.
C++ stands alone as offering hiding without memory safety.
No language did that before C++, and no language has done it
since.

   The basic problem with C++ is that it take's C's rather lame
concept of "array=pointer" and wallpapers over it with
objects.  This never quite works.  Raw pointers keep seeping
out.  The mold always comes through the wallpaper.

   There have been better strongly typed languages.  Modula III
was quite good, but it was from DEC's R&D operation, which was
closed down when Compaq bought DEC.

John Nagle
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Re: Nautilus Python

[Steven D'Aprano]

On Mon, 27 Sep 2010 15:28:34 -0700, Eduardo Ribeiro wrote:

> But it doesn't work.

What do you mean "doesn't work"?

- It crashes the operating system;
- You get a core dump;
- You get an exception;
- It hangs forever, never doing anything;
- It does something unexpected;
- Something else?


-- 
Steven
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Re: reduced-tagged (was Re: toy list processing problem: collect similar terms)

[Steven D'Aprano]

On Mon, 27 Sep 2010 08:18:22 -0700, Mirko wrote:

> Here is my Common Lisp (and I only care about Common Lisp answers)

Good for you. So why are you spamming other newsgroups with your CL 
solution? Not once, but three times.

Replies to /dev/null.

-- 
Steven
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Re: toy list processing problem: collect similar terms

[Seebs]

On 2010-09-26, Xah Lee  wrote:
> On Sep 25, 11:17??pm, Paul Rubin  wrote:
>> Python solution follows (earlier one with an error cancelled). ??All
>> crossposting removed since crossposting is a standard trolling tactic.

> btw, i disagree about your remark on crossposting.

You're wrong.  Crossposting is indeed a standard trolling tactic.

This does not prove that all crossposters are trolls, nor does it assert
that all crossposters are trolls, but it is absolutely factually correct
that it's a standard trolling tactic.

-s
-- 
Copyright 2010, all wrongs reversed.  Peter Seebach / usenet-nos...@seebs.net
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
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Re: toy list processing problem: collect similar terms

[Seebs]

On 2010-09-26, J?rgen Exner  wrote:
> It was livibetter who without any motivation or reasoning posted Python
> code in CLPM.

Not exactly; he posted it in a crossposted thread, which happened to include
CLPM and other groups, including comp.lang.python.

It is quite possible that he didn't know about the crossposting.  However,
while I would agree that this would constitute a form of ignorance, I'd think
that, especially with how well some newsreading interfaces hide that detail,
I don't think it's really worth getting angry over.

-s
-- 
Copyright 2010, all wrongs reversed.  Peter Seebach / usenet-nos...@seebs.net
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
I am not speaking for my employer, although they do rent some of my opinions.
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How to Deal with Xah Lee Spam/Abuse (was: toy list processing problem: collect similar terms)

[John Bokma]

Seebs  writes:

> On 2010-09-26, Xah Lee  wrote:
>> On Sep 25, 11:17??pm, Paul Rubin  wrote:
>>> Python solution follows (earlier one with an error cancelled). ??All
>>> crossposting removed since crossposting is a standard trolling tactic.
>
>> btw, i disagree about your remark on crossposting.
>
> You're wrong.

FYI: Xah Lee is well known for his abuse of cross posting. Be happy that
Google Groups limits the number of groups to crosspost to five.

Related: his spamming behaviour has already resulted in Xah Lee
having to look for another hosting provider [1]. Currently 1and1 provides
him shelter, most likely carefully selected by Xah (as Google Groups)
since 1and1 is not known for their spam fighting reputation nor clue.

But one can only hope, so if you want to do something about this Xah
thing, please report it with 1and1 and ab...@google.com. He won't learn
respect from it, but maybe you end up being honored [2] on his
collection of drivel [3].

In short:

 = don't reply to Xah Lee: at best it's a waste of time
 = if his post is abusive (crossposting to 5 groups just because you can
   is) report it with /and/ his hosting provider (since most of his
   posts are copy paste jobs of articles on his site just to drive
   traffic) and Google Groups (his Usenet provider of choice since they
   hardly do a thing about spam).


[1] http://www.mail-archive.com/python-list@python.org/msg91631.html
[2] http://www.google.com/search?q=site%3Axahlee.org%20bokma
[3] What's sad is that some of its stuff is actually good/not bad. 
But tainted: Xah Lee is a spammer and a Usenet abuser.

-- 
John Bokma   j3b

Blog: http://johnbokma.com/Facebook: http://www.facebook.com/j.j.j.bokma
Freelance Perl & Python Development: http://castleamber.com/
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Re: toy list processing problem: collect similar terms

[John Bokma]

Seebs  writes:

> On 2010-09-26, J?rgen Exner  wrote:
>> It was livibetter who without any motivation or reasoning posted Python
>> code in CLPM.
>
> Not exactly; he posted it in a crossposted thread, which happened to include
> CLPM and other groups, including comp.lang.python.
>
> It is quite possible that he didn't know about the crossposting.

Oh, he does. It has been Xah's game for years.

> while I would agree that this would constitute a form of ignorance, I'd think
> that, especially with how well some newsreading interfaces hide that detail,
> I don't think it's really worth getting angry over.

You think wrong. And Jurgen should have known better than to reply several
times (but like too many people in cplm he posts for posting's sake, the
main reason why I don't follow that group anymore).

Xah has been doing this for many years and most of his posts are just
made to drive traffic to his site (hence they are copy paste of articles
on his site + link(s) to his site). It's Usenet abuse, on purpose.

The reason it pisses off people is that nearly weekly it causes a lot of
noise in newsgroups that are really better off without the noise
(IMNSHO).

See my other post on how to deal with this spammer. If you've missed it:
report him for spamming, since that's what he does. It already made him
have to move hosting providers once. While it's not going to stop him,
it will cost him money. See:
http://www.google.com/search?q=site%3Axahlee.org%20bokma

While I am named in that article be assured that I was not the only one
contacting dreamhost (+10 for doing this, btw). Quite some people
contacted me via email that they also talked with Dreamhost. Just keep
reporting this spammer, and maybe 1and1 will kick it out.

-- 
John Bokma   j3b

Blog: http://johnbokma.com/Facebook: http://www.facebook.com/j.j.j.bokma
Freelance Perl & Python Development: http://castleamber.com/
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Example of exec_proxy

[Prathibha G]

Hi Team,

I am very new to this python world.

Below is my problem.

I have a "Machine A" where i want to execute some commands(dos commands from
command prompt), delete/create some files, delete/create some directories.
All this i need to do from my local host.

Is there a way which i can do? Can ayone help me in achieving this?

I tried using WMI module, but it only starts the processes. It is not
allowing me to execute commands/ work with files and directories.

I got to see this EXEC_PROXY module but i find no examples of it which is
used to connect to remote machine. Could any of you provide that?

-- 
Thank You,
Prathibha
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Re: Nautilus Python

[Peter]

On Sep 28, 12:31 pm, Steven D'Aprano  wrote:
> On Mon, 27 Sep 2010 15:28:34 -0700, Eduardo Ribeiro wrote:
> > But it doesn't work.
>
> What do you mean "doesn't work"?
>
> - It crashes the operating system;
> - You get a core dump;
> - You get an exception;
> - It hangs forever, never doing anything;
> - It does something unexpected;
> - Something else?
>
> --
> Steven

It seems to be a fairly absolute statement - so I would assume all of
the above! :-)
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Re: toy list processing problem: collect similar terms

[Seebs]

On 2010-09-28, John Bokma  wrote:
> Seebs  writes:
>> On 2010-09-26, J?rgen Exner  wrote:
>>> It was livibetter who without any motivation or reasoning posted Python
>>> code in CLPM.

>> Not exactly; he posted it in a crossposted thread, which happened to include
>> CLPM and other groups, including comp.lang.python.

>> It is quite possible that he didn't know about the crossposting.

> Oh, he does. It has been Xah's game for years.

But did "livibetter" know about it?  I wasn't defending Xah, who is indeed
at the very least clueless and disruptive.  But I was sort of defending
the poster who was accused of posting Python code in CLPM, because that
poster may not have understood the game.

-s
-- 
Copyright 2010, all wrongs reversed.  Peter Seebach / usenet-nos...@seebs.net
http://www.seebs.net/log/ <-- lawsuits, religion, and funny pictures
http://en.wikipedia.org/wiki/Fair_Game_(Scientology) <-- get educated!
I am not speaking for my employer, although they do rent some of my opinions.
-- 
http://mail.python.org/mailman/listinfo/python-list

Re: toy list processing problem: collect similar terms

[John Bokma]

Seebs  writes:

fup set to poster

> On 2010-09-28, John Bokma  wrote:
>> Seebs  writes:
>>> On 2010-09-26, J?rgen Exner  wrote:
 It was livibetter who without any motivation or reasoning posted Python
 code in CLPM.
>
>>> Not exactly; he posted it in a crossposted thread, which happened to include
>>> CLPM and other groups, including comp.lang.python.
>
>>> It is quite possible that he didn't know about the crossposting.
>
>> Oh, he does. It has been Xah's game for years.
>
> But did "livibetter" know about it?  I wasn't defending Xah, who is indeed
> at the very least clueless and disruptive.

Heh, he's not clueless, the problem is that he knows exactly what he's
doing. And like most spammers, very hard to get rid off.

> But I was sort of defending
> the poster who was accused of posting Python code in CLPM, because that
> poster may not have understood the game.

Ah, clear. Well, the problem is somewhat also in CLPM where people
somehow have to reply to messages like this :-(. And I am sure Xah
laughes his ass off each time it happens.

-- 
John Bokma   j3b

Blog: http://johnbokma.com/Facebook: http://www.facebook.com/j.j.j.bokma
Freelance Perl & Python Development: http://castleamber.com/
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tix problem in ubuntu karmic

[harryos]

hi

I posted this question in ubuntu users forum but no help was
forthcoming..
I hope someone can help me here.

I had been using  jaunty as o.s and was coding in python 2.6. While
using Tix widgets in my code I came across a bug as mentioned in

https://bugs.launchpad.net/ubuntu/+source/tix/+bug/371720

Also ,there was a suggested fix

http://skriticos.blogspot.com/2009/07/ubuntu-jaunty-904-python-tix-fi...

After that I began to get segmentation fault when I ran the code!!

So ,I  thought upgrading to karmic would help .But even after the
upgrade I am getting segmentation fault..I reinstalled python ,tk and
tix through synaptic..Still the problem persists.

The versions of packages installed  are

python   =2.6.4-0ubuntu3

python-tk =2.6.3-0ubuntu1

tix  =8.4.0-6ubuntu1

tix-dev =8.4.0-6ubuntu1

tk8.5  =8.5.7-1

tk8.4 =8.4.19-3

Can someone tell me how I can solve this problem?

thanks,
harry
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Re: Nautilus Python

[Wayne Brehaut]

On Mon, 27 Sep 2010 20:57:09 -0700 (PDT), Peter
 wrote:

>On Sep 28, 12:31 pm, Steven D'Aprano t...@cybersource.com.au> wrote:
>> On Mon, 27 Sep 2010 15:28:34 -0700, Eduardo Ribeiro wrote:
>> > But it doesn't work.
>>
>> What do you mean "doesn't work"?
>>
>> - It crashes the operating system;
>> - You get a core dump;
>> - You get an exception;
>> - It hangs forever, never doing anything;
>> - It does something unexpected;
>> - Something else?
>>
>> --
>> Steven
>
>It seems to be a fairly absolute statement - so I would assume all of
>the above! :-)

I assume "None of the above." Each of the above requires doing some
work, so if "doesn't work" implies "does no work", then the closest it
could come to that is:

- It terminates almost immediately* without producing any output.

*Required, or it might have been doing some work and just forgot to
output the results.

wwwayne


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