Re: Spelling mistakes!

[Antoon Pardon]

Op 2006-01-10, Terry Hancock schreef <[EMAIL PROTECTED]>:
> On 9 Jan 2006 11:21:10 GMT
> Antoon Pardon <[EMAIL PROTECTED]> wrote:
>> Op 2006-01-06, Terry Hancock schreef
>> <[EMAIL PROTECTED]>:
>> > On 6 Jan 2006 07:30:41 -0800
>> > "KraftDiner" <[EMAIL PROTECTED]> wrote:
>> >> in an init method I declare a variable 
>> >self.someLongName > 
>> >> later in a different method of the class I use
>> >> self.sumLongName
>> >> Now I really meant self.someLongName.
>> >> In fact I don't want a variable called sumLongName.
>> >> Frankly how are you ever to know if this type of error
>> >is > occuring?
>> >
>> > Both "unit tests" and "interfaces" are useful for
>> > catching simple errors like this one.  There is a
>> > 'unittest' module in the Python standard library, and
>> > 'interface' modules are available from the Zope 3
>> > project and PyProtocols, both are good.
>> 
>> I don't think unit tests are that helpfull in this case.
>> Unit tests help you in finding out there is a bug, they
>> don't help that much in tracking down a bug.
>> 
>> I for some reason a person is reading over the difference
>> between sumLongName and someLongName and doesn't notice
>> the different spelling in his source a unit test won't
>> be of much help.
>
> Well, if you are doing fairly frequent unit tests, then you
> will have written a unit test to test the "someLongName"
> method, and if you manage to type "sumLongName" in BOTH the
> code and the unit test, then there must be some Freudian
> reason you really did want to use "sumLongName". ;-)

Who says someLongName is a method?

> It's a bit like the standard practice of making you type a
> password twice. In fact, most of the common "bug avoidance"
> methods in programming all come down to this -- you have to
> type the same thing twice in two different places to get
> the result.
>
> C and C++ make you do declarations -- so you have
> to mention the name before you can use it.  You have to type
> the variable names twice.

But that is not an accepted idea here in c.p.l. I also find
it strange that redundancy via type declarations is so hard
resisted here and is then defended with the argument it
isn't needed is you test sufficiently (with unit tests)
which is also a kind of redundancy.

> Interfaces define the "publically viewable" parts of a
> class, then you have to actually create them in a separate
> class definition.  You have to type the methods twice.

> In unit testing, you write the code, then write code to test
> the code, which must correctly identify the methods in the
> code. So you have to type 'everything' twice.

But you don't type attribute names twice in unit tests,
because attributes are in general implementation details
that are of no concern to the tester. So unit tests can
not introduce the redundancy to find out a missed spelled
attribute in some methods.

> The ideal of "don't repeat yourself" seems to get
> nudged out by "repeat yourself exactly once" when it's
> really important to get it right. ;-)
>
> It's really just a fancy way to force you to proof-read your
> own work carefully enough (which is tricky because you 
> tend to ignore stuff that's too repetitious).

Yes and you also tend to read over your own spelling errors.

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Re: Why keep identity-based equality comparison?

[Antoon Pardon]

Op 2006-01-10, Christopher Subich schreef <[EMAIL PROTECTED]>:
> Antoon Pardon wrote:
>> Op 2006-01-10, Peter Decker schreef <[EMAIL PROTECTED]>:
>
>>>I don't see the two comparisons as equivalent at all. If two things
>>>are different, it does not follow that they can be ranked.
>> 
>> 
>> That a < b returns false doesn't imply that a and b can be ranked.
>> take sets. set([1,2]) and set([1,3)) can't be ranked but 
>> set([1,2]) < set([1,3)) returns False just as set([1,2]) > set([1,3))
>> does.
>
> Breaking my resolution already, but you're ignoring the fact that the 
> set type uses the '<' and '>' operators from a set-theoretic, not 
> number-theoretic point of view.

That is irrelevant. the '<' and '>' symbols are usable to denote any
mathematical order and are often enough used for even other order
relations. The only reason that other symbols like the subset symbol
are used is to avoid confusion about which order you are talking
because numbers and sets are used together often enough.

But the superset relationship is mathematically just as much an
order relation as is the greater than relationship.

> Saying "set(1,3) is greater than 
> set(1,2)" is meaningless (and not false), because the mathematical basis 
> of the operator in this context is superset -- "set(1,3) is a superset 
> of set(1,2)" is well-defined and false.

No it is not meaningless. The superset relationship is just as much
an order relationship and thus can mathematically make use of the
'<' and '>' symbol just as any mathematical order relation can.

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Re: Failing unittest Test cases

[Michele Simionato]

[EMAIL PROTECTED] wrote:
> Michele> I am also +1 to run the tests in the code order.
>
> Got any ideas how that is to be accomplished short of jiggering the names so
> they sort in the order you want them to run?
>
> Skip

Well, it could be done with a decorator, but unittest is already
cumbersome how it is,
I would not touch it. Instead, I would vote for py.test in the standard
library.

   Michele Simionato

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python-soappy

[Yves Glodt]

Hi list,

can anybody point me to a tutorial, howto or example code of 
python-soappy...? google did not have really useful results about...


Best regards,
Yves
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Re: Encoding sniffer?

[Stuart Bishop]

[EMAIL PROTECTED] wrote:
> Andreas> Does anyone know of a Python module that is able to sniff the
> Andreas> encoding of text?
> 
> I have such a beast.  Search here:
> 
> http://orca.mojam.com/~skip/python/
> 
> for "decode".
> 
> Skip

We have similar code. It looks functionally the same except that we also:

Check if the string starts with a BOM.
Detects probable ISO-8859-15 using a set of characters common
is ISO-8859-15 but uncommon in ISO-8859-1
Doctests :-)

# Detect BOM
_boms = [
(codecs.BOM_UTF16_BE, 'utf_16_be'),
(codecs.BOM_UTF16_LE, 'utf_16_le'),
(codecs.BOM_UTF32_BE, 'utf_32_be'),
(codecs.BOM_UTF32_LE, 'utf_32_le'),
]

try:
for bom, encoding in _boms:
if s.startswith(bom):
return unicode(s[len(bom):], encoding)
except UnicodeDecodeError:
pass

[...]

# If we have characters in this range, it is probably ISO-8859-15
if re.search(r"[\xa4\xa6\xa8\xb4\xb8\xbc-\xbe]", s) is not None:
try:
return unicode(s, 'ISO-8859-15')
except UnicodeDecodeError:
pass

Feel free to update your available code. Otherwise, I can probably post ours
somewhere if necessary.

-- 
Stuart Bishop <[EMAIL PROTECTED]>
http://www.stuartbishop.net/


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Re: Change Gateway Programmatically

[Godwin Burby]

Thanx again.

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Re: OT: Degrees as barriers to entry [was Re: - E04 - Leadership! Google, Guido van Rossum, PSF]

[Steve Holden]

Steven D'Aprano wrote:
> On Tue, 03 Jan 2006 08:27:39 -0800, Alex Martelli wrote:
> 
> 
>>Or some even more stringent qualification, such as the state's Bar exam
>>for lawyers -- you may not be able to sit for that exam w/o the
>>appropriate degree, but the degree by itself is not enough, you still
>>have to pass the exam.  It is that way for Engineers in Italy (I passed
>>my State Exam in the early '80s), although you only need the certificate
>>for some specific professional undertakings (e.g. design a ship, or a
>>large building, or technically supervise building operations beyond a
>>certain size -- not to write software or to design chips).
>>
>>Personally, I agree with the theory, first expressed by Adam Smith, that
>>such barriers to entry are mostly useful to grant practitioners of a
>>certain profession the "scarcity value" that lets them charge higher
>>prices, although of course they're always presented as "good for
>>society".  Note that in Europe in the Middle Ages you needed strict
>>qualifications of that kind for just about anything -- you could not
>>make hats unless you belonged to the Hatters' Guild, etc; most of those
>>restrictions have since been lifted, but a few groups (doctors, lawyers,
>>accountants, ...) have managed to keep them in place.
> 
> 
> Let's not confuse the medieval guild system with today's system. Guilds
> were more like clubs than professional bodies: it was who you knew, rather
> than what you knew, that decided whether you got in. You were forbidden
> from becoming (say) a hat maker unless the other hat makers allowed you to
> join the guild. There was no independent, or even semi-independent, body
> who decided what qualifications were needed to make hats. It was all about
> who you knew -- if your uncle's best friend was a hat maker, you could be
> apprenticed to a hat maker and join the guild, otherwise there was no exam
> to sit that got you in, no matter how talented you were.
> 
I believe you are overlooking the fact that you had to serve an 
apprenticeship that only ended when you ether produced work of master 
craftsman quality or decided you would be better employed elsewhere. 
This isn't to refute the truth of Smith's assertion that the guilds 
controlled scarcity, giving them some control over price. But today's 
world, the world of "polite incompetence" (a phrase used about Virginia 
society by a dear neighbour in the USA) where few can perform the jobs 
they are paid to, but everything is cheap.

> This system combined the worst of all outcomes: you got artificial
> scarcity with the monopoly pricing that leads to, *plus* it failed to
> enforce or even encourage minimum standards of skill and strategy.
> 
Wrong [see above]. I don't remember many mediaeval cathedrals falling 
down, but the Tacoma Narrows bridge was a practical lesson in 
engineering. So what's your real point?

> By contrast, today's professional bodies like law, medicine etc. have
> independent standards of skill that must be met. I don't wish to deny
> that knowing the right people can help smooth the procedure of becoming
> a doctor, lawyer, etc., but failing to have an uncle who is a lawyer is no
> barrier to becoming a lawyer, provided you can pass the bar exam. That is
> very different from the guild system.
> 
Well, one might equally argue that becoming a master mason in the past 
required you to produce master masonic work. Since professions and 
crafts are somewhat different, however, it's unlikely to be fruitful to 
attempt to draw direct comparisons. Maybe having an uncle helped you in 
to the trade, but it didn't cut you much slack in terms of required 
standards, hence the absence of cathedral-shaped heaps of rubble. York 
Minster was built in the 1400s, for example, and doesn't look like 
falling down any time soon.

I can't think of many modern American houses likely to survive more than 
a century. They are built to a price, not a quality. The situation is 
rather different in some other countries, where natural resources have 
been depleted for longer and are correspondingly more valued.

> In general, professional bodies like engineers, doctors, etc. do a
> reasonable job of enforcing minimum standards of skill and quality.
> Certainly there are a lot fewer building collapses in countries that
> enforce building standards than countries that allow the free market to
> decide.
> 
The major problem with professional bodies is precisely their lack of 
insistence on a practical demonstration of capability. "Paper MCSEs", 
for example, frequently make bad Windows system administrators because 
their education has been geared to the acquisition not of practical 
skills but of the qualification itself. The medical profession acquits 
itself reasonably because it does still require a good amount of 
doctoring before qualification. Why are the lawyer jokes not doctor jokes?

> Free market radicals like to sneer at "for the good of society" arguments,
> but the problem with th

Re: python-soappy

[Nico Grubert]

 > can anybody point me to a tutorial, howto or example code of
 > python-soappy...? google did not have really useful results about...

This might be helpful:
  http://www-128.ibm.com/developerworks/library/ws-pyth5/
  http://users.skynet.be/pascalbotte/rcx-ws-doc/python.htm

Nico
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Re: Why keep identity-based equality comparison?

[Antoon Pardon]

Op 2006-01-10, Mike Meyer schreef <[EMAIL PROTECTED]>:
> Antoon Pardon <[EMAIL PROTECTED]> writes:
 There is no way in python now to throw an exception when you
 think comparing your object to some very different object
 is just meaningless and using such an object in a container
 that can be searched via the "in" operator.
>>> I claim that comparing for equality is *never* meaningless. Either two
>>> objects are equal, or they aren't.  It may be that they are of
>>> different types - like the enum example above - in which case they
>>> will never compare equal.
>>> Note that this is different from an ordering. It's possible to have a
>>> pair of objects - maybe even of the same type - that can't be ordered
>>> in anyway. In this case, raising an exception when you try that
>>> comarison makes sense.
>> IMO you have the choice between taking the mathematical route or
>> the practical route.
>
> The behavior proposed for Py3k *is* the practical route. It gives a
> reasonable behavior, and one that leads to simple implemenations for
> container operations.

Then I have to ask, practical for who, user of python or the
implementor, because I don't find it practical that a language
says at the same times that two objects can use a comparision
and can't.

>> Now you can take the practical option and decide that programmatically
>> it make no sense to compare a specific couple of values and throw an
>> exception in this case, but it doesn't matter much which test you are
>> conducting at that point.
>
> Can you provide a case where having a test for equality throw an
> exception is actually useful?

I'm not going to bother with that. Sure uses cases are interesting
but if you always wait for a use case before implementing something,
whatever the other arguments are, you will disappoint the future
people with a use case because they can't do what they want yet.

I haven't seen a case where testing for unequality throwing an
exception would be actually usefull, yet that is considered,
why do I have to provide a use case.

> BTW, the case you're arguing for is *different* from the case the OP
> proposed. By my reading, he wanted equality testing to throw an
> exception for two objects unless a comparison was explicitly coded. So
> that even a == a could cause an exception.

Why not? If a is of a type where == is a meaningless operation then
a == a is meaningless too.

>> Maybe python should adopt both approaches and introduce a new family
>> of comparators. Then one family will always succeed and the other
>> family can throw an exception.
>
> Comparators - including equality comparators - can already throw
> exceptions. The enum case proved that.

Your point? Your remark says nothing for or against python having
two families of comparators, one that is defined as never throwing
an exception and one defined as exception throwable.

> Also, every container type now has this split between identity and
> equality has to be dealt with for *every* container class. If you want
> identity comparisons on objects, you have to store them in an idlist
> for the in operator and index methods to work properly.
> I also think your basic idea is wrong. The expression "x == y" is
> intuitively False if x and y aren't comparable.
 But there are certainly circumstances that I would prefer 1 == (1,2)
 to throw an exception instead of simply turning up False.
>>> So what are they?
>
> Again - give us real use cases.

I didn't see a real use case for 1 < (1,2) throwing an exception either.
The only argument seems to be that the current behaviour confuses
beginners. But I don't see that as such a strong argument because
a number of other things confuse beginners too and are not up
for a change. I also think that 1 == (1,2) returning False but
1 < (1,2) throwing an excpetion masy not be that less confusing
as the current behaviour.

I don't care that much what it will be, but I would prefer a consistent
approach for all comparators. No either all throw an exception when
the two operands are of differnt type or None does (or two families)

 I would say some more thinking is needed in this area. Now we can
 have weird circumstances where A == B and B == C but A != C.
>>> Nothing wierd about that at all. Anyone who's dealt with floats at all
>>> should be used to it.
>> With floats that is entirely a problem of precision. When you are
>> working with discrete types such circumstances remain weird.
>
> Floats *are* a discrete type. The equality *relationship* is what's
> fuzzy. There are lots of non-transitive relationships around. I don't
> find them wierd at all.

That there are a lot of non-transitive relationships and that there
is nothing weird about them, says nothing about one specific
relationship, == which normaly is considered to be transitive
and turns out not to be.

Beside I think the == comparison is transitive on the floats. It
is just that if you do your calculations that

Re: Cross Compile Mips / Linux

[Frithiof Andreas Jensen]

<[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Hi Everyone,

> Should I try using a Linux based machine for the build,  would that
> help??

YES -

The problem is that the Linux build tools generally assume that they are
sitting in the target environment and therefore tries to use facilites
discovered by the tools and discoveries about "endianess" and such; This is
a general problem with the design of the Linux build system - the "I am on
the target" assumptions are likely to be "smeared" over many applications.

WindRiver (an embedded Linux provider) f.ex. makes a living off - amongst
other things - providing an environment enabling Linux+applications to be
reliably cross compiled!

What we prefer to do is to use a "King-Size" version of the target hardware
with a full set of tools and libraries to build on and then pack a file
system with just the built Kernel + Application(s) for the target into an
"initrd image" (
http://www.tldp.org/LDP/Linux-Filesystem-Hierarchy/html/initrd.html ) and
have the real target download & boot that.

This is because we are often doing tricky stuff with "new" CPU's where the
Kernel is barely ready so we like to be sure that the bugs are in the code
and not freebies provided by the cross compiler tools.

 ... and the latest embedded target happens to be an 8-Way Opteron card with
16 GB RAM that does not take eons to compile ;-)


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Restart process with SIGHUP

[LukasMeyerUK]

Hello,

I'm trying to restart a process with the os.kill command. My Problem is
that if the command gets executed, my python script stops working. I
want to SIGHUP a process with the following command: os.kill(pid,
signal.SIGHUP).

Can anyone give me a hint in solving this?

Best regards,

Lukas

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Re: New Python.org website ?

[Steve Holden]

Bugs wrote:
> Aahz wrote:
> 
>>Dunno about "in time for the new year", but there is a new design that is
>>supposedly in final stages of getting implemented.  What's your hurry?
> 
> 
> No hurry:
> http://tinyurl.com/8d9ar

http://beta.python.org

Happy New Year. We could do with some help completing the conversion if 
people have some free time. It would be nice if it could be completed 
for PyCon. Start at

http://psf.pollenation.net/

regards
  Steve
-- 
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Holden Web LLC www.holdenweb.com
PyCon TX 2006  www.python.org/pycon/

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Bug in struct.pack?

[Alex Stapleton]

from struct import pack
 >>> pack("B", 1)
'\x01'
 >>> pack("BB", 0, 1)
'\x00\x01'
 >>> pack("BI", 0, 1)
'\x00\x00\x00\x00\x01\x00\x00\x00'
 >>> calcsize("BI")
8
 >>> calcsize("BB")
2

Why does an unsigned char suddenly become 4 bytes long when you  
include an unsigned int in the format string? It's consistent  
behaviour but it's incorrect.

Also.

 >>> calcsize('BL')
8
 >>> calcsize('BBL')
8
 >>> calcsize('BBBL')
8
 >>> calcsize('L')
8
 >>> calcsize('BL')
12
 >>> pack("BBBL", 255,255,255,0)
'\xff\xff\xff\x00\x00\x00\x00\x00' ### That's 3 255's and 5(!?!?)  
0's
 >>> pack("L", 255,255,255,255,0)
'\xff\xff\xff\xff\x00\x00\x00\x00' # 4 255's and 4 0's!

Which is all kinds of wrong.

BL should be 9
BBL should be 10


Python 2.4.1 (#2, May  5 2005, 11:32:06)
[GCC 3.3.5 (Debian 1:3.3.5-12)] on linux2

Same behaviour on my PowerBook using

Python 2.3.5 (#1, Mar 20 2005, 20:38:20)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin

sizeof(unsigned long) should be 8 on both of these platforms
sizeof(unsigned char) should be 1 on both as well

So am I just being stupid and not specifying something I should be?  
Or is struct really that broken?
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Re: New Python.org website ?

[Steve Holden]

Bugs wrote:
> Aahz wrote:
> 
>>Dunno about "in time for the new year", but there is a new design that is
>>supposedly in final stages of getting implemented.  What's your hurry?
> 
> 
> No hurry:
> http://tinyurl.com/8d9ar

http://beta.python.org

Happy New Year. We could do with some help completing the conversion if 
people have some free time. It would be nice if it could be completed 
for PyCon. Start at

http://psf.pollenation.net/

regards
  Steve
-- 
Steve Holden   +44 150 684 7255  +1 800 494 3119
Holden Web LLC www.holdenweb.com
PyCon TX 2006  www.python.org/pycon/

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Re: Reading from input file.

[Sheldon]

Hi Kyrstian,

Try reading the file with ope(file,'r').read()
and  then split the string using '\n' as the delimiter (this will break
the file down into each individual line consisting of several columns).
Then string split each line of the file (unsing '  ' as the delimiter),
they should now be 3, or more, columns per line, and store each column
in a vector - adding each line to the vector with append function. Then
place each vector in a list.
Now you  should have a file to compare with the next one. But watch out
for files of varying lengths as they cannot be compared on a one-to-one
basis. One you have each file in a list or vector or dictionary or
array style, comparison and calculations should be straight forward.

Hope this points you in the right direction. I haven't tried this
myself but I have done a similar thing earlier but I strongly believe
that it should work.

Sincerely,
Sheldon

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Re: OT: Degrees as barriers to entry [was Re: - E04 - Leadership!Google, Guido van Rossum, PSF]

[Richard Brodie]

"Steve Holden" <[EMAIL PROTECTED]> wrote in message 
news:[EMAIL PROTECTED]

> Wrong [see above]. I don't remember many mediaeval cathedrals falling down.

Your memory of medieval times has gone a bit hazy I expect; in truth,
some would fall down from time to time, particularly if the builders tried
something particularly ambitious. What are left are the good designs. 


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PyDev 0.9.8.6 released

[Fabio Zadrozny]

Hi All,

PyDev - Python IDE (Python Development Enviroment for Eclipse) version 
0.9.8.6 has been released.

Check the homepage (http://pydev.sourceforge.net/) for more details.

Details for Release: 0.9.8.6:

Major highlights:
---

   * Added a new 'Pydev project' wizard (Mikko Ohtamaa contribution) -- 
it is named as Pydev Project instead of Python project because it 
creates Python and Jython projects.
   * Added a new 'Pydev module' wizard (Mikko Ohtamaa contribution) -- 
NOTE: it still needs some work.
   * Changes in the shell spawning were done, and no hangs should appear 
when trying to do code-completion anymore (if it still hapens, please 
report it as a bug -- NOTE: a little delay on the first time 
code-completion is executed is expected, as this is the time the shell 
is started).
   * Other bugfixes (as usual)

Cheers,

Fabio

-- 
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--
Software Developer

ESSS - Engineering Simulation and Scientific Software
www.esss.com.br

PyDev - Python Development Enviroment for Eclipse
pydev.sf.net
pydev.blogspot.com

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Maximum List size (item number) limit?

[Kriston-Vizi Janos]

Dear Mr. Kern, and Members,

Thank you very much for the fast answer, my question became 
over-simplified.

My source code is appended below. It uses two text files (L.txt and 
GC.txt) as input and merges them. Please find these two files here:
http://kristonvizi.hu/L.txt
http://kristonvizi.hu/GC.txt

Both L.txt and GC.txt contains 3000 rows. When running, the code stops 
with error message:

'The debugged program raised the exception IndexError "list index out of 
range"
File: /home/kvjanos/file.py, Line: 91'

And I noticed that all the lists that should contain 3000 items, 
contains less as follows:
NIR_mean_l = 1000 items
NIR_stdev_l = 1000 items
R_mean_l = 1000 items
R_stdev_l = 1000 items
G_mean_l = 999 items
G_stdev_l = 999 items
area_l = 999 items

NIR_mean_gc = 1000 items
NIR_stdev_gc = 1000 items
R_mean_gc = 1000 items
R_stdev_gc = 1000 items
G_mean_gc = 999 items
G_stdev_gc = 999 items
area_gc = 999 items

This is why I thought it is a limit in list items number.

Code that's failing:
#***

import string,sys,os,sets

# Open L, GC txt files and create merged file
inp_file_l = open('/home/kvjanos/L/L.txt') 
inp_file_gc = open('/home/kvjanos/GC/GC.txt') 
out_file = open('/home/kvjanos/L_GC_merged/merged.txt', 'w')

# Define L lists
NIR_mean_l = []
NIR_stdev_l =[]
R_mean_l = []
R_stdev_l =[]
G_mean_l = []
G_stdev_l =[]
area_l = []

# Define GC lists
NIR_mean_gc = []
NIR_stdev_gc =[]
R_mean_gc = []
R_stdev_gc =[]
G_mean_gc = []
G_stdev_gc =[]
area_gc = []


# Processing L file
line_no_l =0# Input L file line number
type_l = 1  # Input L file row type: 1 (row n),2 (row n+1) or 3 (row n+2)
   
# Append L values to lists.
for line in inp_file_l.xreadlines():
line_no_l = line_no_l + 1
if line_no_l == 1:  # To skip the header row
continue   
data_l = []   # An L row   
data_l = line.split()
   
if type_l == 1:  
NIR_mean_l.append(data_l[2])  # Append 3rd item of the row to 
the list
NIR_stdev_l.append(data_l[3])  # Append 4th item of the row to 
the list   
type_l = 2  # Change to row n+1
  
else:
if type_l == 2:
R_mean_l.append(data_l[2])
R_stdev_l.append(data_l[3])
type_l = 3
else:
G_mean_l.append(data_l[2])
G_stdev_l.append(data_l[3])  
area_l.append(data_l[1])
type_l = 1
inp_file_l.close()


# Processing GC file, the same way as L file above
line_no_gc =0
type_gc = 1

for line in inp_file_gc.xreadlines():
line_no_gc = line_no_gc+ 1
if line_no_gc== 1:
continue   
data_gc = []
data_gc = line.split()
   
if type_gc== 1:  
NIR_mean_gc.append(data_gc[2])
NIR_stdev_gc.append(data_gc[3])  
type_gc= 2
  
else:
if type_gc== 2:
R_mean_gc.append(data_gc[2])
R_stdev_gc.append(data_gc[3])
type_gc= 3
else:
G_mean_gc.append(data_gc[2])
G_stdev_gc.append(data_gc[3])
area_gc.append(data_gc[1])
type_gc= 1
inp_file_gc.close()

 #

# Create output rows from lists
for i in range(len(NIR_mean_l)): # Process all input rows

# Filters L rows by 'area_l' values
area_l_rossz = string.atof(area_l[i])
if area_l_rossz < 1:   
continue
elif area_l_rossz > 10:
continue
   
# Filters GC rows by 'area_gc' values   
area_gc_rossz = string.atof(area_gc[i])
if area_gc_rossz < 1:  
continue
elif area_gc_rossz > 20:   
continue
   
# Create output line and write out
newline = []
newline.append(str(i+1))
# L
newline.append(NIR_mean_l[i])
newline.append(NIR_stdev_l[i])
newline.append(R_mean_l[i])
newline.append(R_stdev_l[i])
newline.append(G_mean_l[i])
newline.append(G_stdev_l[i])
newline.append(area_l[i])
# GC
newline.append(NIR_mean_gc[i])
newline.append(NIR_stdev_gc[i])
newline.append(R_mean_gc[i])
newline.append(R_stdev_gc[i])
newline.append(G_mean_gc[i])
newline.append(G_stdev_gc[i])
newline.append(area_gc[i])
outline =  string.join(newline,'\t') + '\n'
out_file.writelines(outline)
   
out_file.close()
  
#***

Thnx again,
Janos




> Kriston-Vizi Janos wrote:
> >/ Dear Members,
> />/ 
> />/ Is there any possibility to use more than 999 items in a list?
> /
> Yes. Of course.
>
> >/ Cannot 
> />/ append more than 999 items. 
> /
> Post the code that's failing for you and the error message it generates.
>
> And please read http://www.catb.org/~esr/faqs/smart-questions.html 
>  . It will
> help us help you.
>
> >/ The same problem with 'array' type. Is it a 
> />/ result of a default setting maybe?
> /
> No.
>
> -- 
> Robert Kern
> rob

Re: Bug in struct.pack?

[Raymond Hettinger]

[Alex Stapleton]
> from struct import pack
>  >>> pack("B", 1)
> '\x01'
>  >>> pack("BB", 0, 1)
> '\x00\x01'
>  >>> pack("BI", 0, 1)
> '\x00\x00\x00\x00\x01\x00\x00\x00'
>  >>> calcsize("BI")
> 8
>  >>> calcsize("BB")
> 2
>
> Why does an unsigned char suddenly become 4 bytes long when you
> include an unsigned int in the format string? It's consistent
> behaviour but it's incorrect.

You're seeing native alignment come into play.
Specify a standard alignment to avoid padding.

>>> pack("BI", 0, 1)
'\x00\x00\x00\x00\x01\x00\x00\x00'
>>> pack("=BI", 0, 1)
'\x00\x01\x00\x00\x00'

All is explained in the docs:
 http://docs.python.org/lib/module-struct.html


Raymond

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Re: Bug in struct.pack?

[Alex Stapleton]

< Idiot.

On 11 Jan 2006, at 10:46, Alex Stapleton wrote:

> from struct import pack
 pack("B", 1)
> '\x01'
 pack("BB", 0, 1)
> '\x00\x01'
 pack("BI", 0, 1)
> '\x00\x00\x00\x00\x01\x00\x00\x00'
 calcsize("BI")
> 8
 calcsize("BB")
> 2
>
> Why does an unsigned char suddenly become 4 bytes long when you
> include an unsigned int in the format string? It's consistent
> behaviour but it's incorrect.
>
> Also.
>
 calcsize('BL')
> 8
 calcsize('BBL')
> 8
 calcsize('BBBL')
> 8
 calcsize('L')
> 8
 calcsize('BL')
> 12
 pack("BBBL", 255,255,255,0)
> '\xff\xff\xff\x00\x00\x00\x00\x00' ### That's 3 255's and 5(!?!?)
> 0's
 pack("L", 255,255,255,255,0)
> '\xff\xff\xff\xff\x00\x00\x00\x00' # 4 255's and 4 0's!
>
> Which is all kinds of wrong.
>
> BL should be 9
> BBL should be 10
> 
>
> Python 2.4.1 (#2, May  5 2005, 11:32:06)
> [GCC 3.3.5 (Debian 1:3.3.5-12)] on linux2
>
> Same behaviour on my PowerBook using
>
> Python 2.3.5 (#1, Mar 20 2005, 20:38:20)
> [GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
>
> sizeof(unsigned long) should be 8 on both of these platforms
> sizeof(unsigned char) should be 1 on both as well
>
> So am I just being stupid and not specifying something I should be?
> Or is struct really that broken?
> -- 
> http://mail.python.org/mailman/listinfo/python-list

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exec a string in an embedded environment

[Tommy R]

Hi all pythonistas!

I have a problem with my embedding of python inside a c app.

very short background
I work on a safety critical embedded application that runs on VxWorks.
I have successfully ported the interpreter to VW. In my solution I have
restricted other "classes" to use python through my simplified api. Its
a really complex architecture that force me to work this way, I have
encapsulated the entire interpreter with its own memspace and so on.
Redirected all IO signals and such.

To the problem
I need some way to execute a string and pass arguments to the functions
inside the string. We have discussed a solution where we first load the
string (containing some funcs) and then run something similar to
Py_RunString("foo(1.0, 'str')");  We need to do this in a generic way
so we can send in arbitrary arguments.

Can I use Py_CompileString to get a PyObject to that 'module' and then
in some magic way call a function within that module?

I am totaly out of ideas so please help me anyone.


//Tommy

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Re: String question - find all possible versions of a person's firstname

[bonono]

Nico Grubert wrote:
> > This sounds like a homework problem.  You might try splitting the name
> > at the e's, check the length of the resulting list and do that many
> > nested loops.
>
> This was my idea too but I am wondering if there are any scripts for
> tasks like this.
>
> Nico

def combine_lol(seq): return reduce(lambda x,y: (a+(b,) for a in x for
b in y), seq, [()])

def shuffle(seq, elem):
"""
"hello","eo" -> helle,hello,hollo,hollo
"""
idx = [i for (i,c) in enumerate(seq) if c in elem]
l = 2**len(idx)
com = combine_lol([elem]*len(idx))
pos = ( zip(*x) for x in izip([idx]*l, com) )
def replace(s, ki):
for i,e in ki: s[i] = e
return s

r = imap(replace, (list(seq) for x in xrange(l)), pos)
if isinstance(seq,basestring): return ( ''.join(x) for x in r)
else: return r

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Re: Maximum List size (item number) limit?

[Steve Holden]

Kriston-Vizi Janos wrote:
> Dear Mr. Kern, and Members,
> 
> Thank you very much for the fast answer, my question became 
> over-simplified.
> 
> My source code is appended below. It uses two text files (L.txt and 
> GC.txt) as input and merges them. Please find these two files here:
> http://kristonvizi.hu/L.txt
> http://kristonvizi.hu/GC.txt
> 
> Both L.txt and GC.txt contains 3000 rows. When running, the code stops 
> with error message:
> 
> 'The debugged program raised the exception IndexError "list index out of 
> range"
> File: /home/kvjanos/file.py, Line: 91'
> 
This error does not indicate that you cannot add further items to a 
list. It indicates that you are trying to address a list item that 
hasn't yet been added.

It would have been more helpful to post the *whole* traceback. 
Furthermore, why  do you assume that a 999 is an implementation limit on 
the basis of this search result:

>> What is the maximum listsize in python? In characters
>> or items. Thnx.
> 
> 2147483647 items, on most platforms.  if you have enough
> memory, that is.

Does 2147483647 look similar enough to 999 to be confusing?

regards
  Steve
-- 
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Holden Web LLC www.holdenweb.com
PyCon TX 2006  www.python.org/pycon/

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Re: Maximum List size (item number) limit?

[Juho Schultz]

Kriston-Vizi Janos wrote:
> Dear Mr. Kern, and Members,
> 
> Thank you very much for the fast answer, my question became 
> over-simplified.
> 
> My source code is appended below. It uses two text files (L.txt and 
> GC.txt) as input and merges them.
> 
> Both L.txt and GC.txt contains 3000 rows. When running, the code stops 
> with error message:
> 
> 'The debugged program raised the exception IndexError "list index out of 
> range"
> File: /home/kvjanos/file.py, Line: 91'
> 
> And I noticed that all the lists that should contain 3000 items, 
> contains less as follows:
> NIR_mean_l = 1000 items

> Code that's failing:

> # Processing L file
> line_no_l =0# Input L file line number
> type_l = 1  # Input L file row type: 1 (row n),2 (row n+1) or 3 (row n+2)
> # Append L values to lists.
> for line in inp_file_l.xreadlines():
> line_no_l = line_no_l + 1
> if line_no_l == 1:  # To skip the header row
>continue  
> data_l = []   # An L row  
> data_l = line.split()
> if type_l == 1: 
>NIR_mean_l.append(data_l[2])  # Append 3rd item of the row to the list
>NIR_stdev_l.append(data_l[3])  # Append 4th item of the row to the list
>type_l = 2  # Change to row n+1
> else:
> if type_l == 2:
> R_mean_l.append(data_l[2])
> R_stdev_l.append(data_l[3])
> type_l = 3
> else:
> G_mean_l.append(data_l[2])
> G_stdev_l.append(data_l[3]) 
> area_l.append(data_l[1])  
> type_l = 1
> inp_file_l.close()
> 

Looking at the data files, it seems there is no header row to skip.
Skipping 1st row seems to cause the discrepancy of vector sizes,
which leads to the IndexError. should NIR_mean_l[0] be 203 or 25?

As the comments in your code suggest, the code adds values to
NIR_mean_l only from lines 1, 4, 7, ...
R_mean_l only from lines 2, 5, 8, ...
G_mean_l only from lines 3, 6, 9, ...
Try with 12 lines of input data and see how the vectors
are 4 elements before filtering/writing.
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Re: New Python.org website ?

[Fuzzyman]

Now that is a very cool site.

I'm not very good with HTML - but can write content... I might see if
there is something I can do.

All the best,

Fuzzyman
http://www.voidspace.org.uk/python/index.shtml
(and yes I do get referrals from these links...)

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Re: How can I test if an argument is a sequence or a scalar?

[Fuzzyman]

That's a neat little piece of code there.

All the best,

Fuzzyman
http://www.voidspace.org.uk/python/index.shtml

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Re: File Paramaterized Abstract Factory

[Charles Krug]

On 2006-01-11, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
> Charles Krug wrote:
>
>> What I'd like is to do something like this:
>>
>> factoryFile = sys.argv[1] # we assume that argv[1] implements a
>>   # correct ThingMaker interface.
>
> sys.argv[1] is a string, so I assume that you meant to say that
> the module named by argv[1] implements the correct interface.

Yes.

>
>> Anywho, my problem is with the whole Miracle thing.
>>
>> I've tried using __import__:
>>
>> a = 'HerFactory'
>> __import(a)
>>
>> Which returns:
>>
>> 
>
> try:
>
> factoryObject = __import__(factoryFile)
> print dir(factoryObject)
>

Ah Ha!

That's what comes of working from memory instead of letting the computer
remember for me.

>>> factoryFile = 'ThingMaker'
>>> factoryObject = __import__(factoryFile)
>>> print dir(factoryObject)
['MakeOtherThing', 'MakeThing', '__builtins__', '__doc__', '__file__', 
'__name__']
>>> factoryObject.MakeThing()
I made a Thing!

Wonderful!  Exactly what I'm after, thanks.

> this should give you a list of the functions in the given module,
> or an ImportError if it doesn't exist.
>

Yes, that's what I was getting.  Should have pasted that as well, but I
was feeling grumpy and impatient.

Thanx


Charles
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Re: Maximum List size (item number) limit?

[bearophileHUGS]

Juho Schultz
>NIR_mean_l only from lines 1, 4, 7, ...
>R_mean_l only from lines 2, 5, 8, ...
>G_mean_l only from lines 3, 6, 9, ...

This can be the problem, but it can be right too.
The following code is shorter and I hope cleaner, with it maybe
Kriston-Vizi Janos can fix his problem.

class ReadData:
def __init__(self, filename):
self.NIR_mean = []
self.NIR_stdev = []
self.R_mean = []
self.R_stdev = []
self.G_mean = []
self.G_stdev = []
self.area = []

for line in file(filename):
row = line.split()
self.area.append(row[1])
self.NIR_mean.append(row[2])
self.NIR_stdev.append(row[3])
self.R_mean.append(row[4])
self.R_stdev.append(row[5])
self.G_mean.append(row[6])
self.G_stdev.append(row[7])

# ---
L = ReadData('L.txt')
GC = ReadData('GC.txt')
out_file = file('merged.txt', 'w')

# Create output rows from lists
for i in xrange(len(L.NIR_mean)): # Process all input rows

# Filter L and GC rows by area values
if (1 <= float(L.area[i]) <= 10) and \
   (1 <= float(GC.area[i]) <= 10):

# Create output line and write out
newline = [str(i+1)]
for obj in L, GC:
newline.extend([obj.NIR_mean[i], obj.NIR_stdev[i],
obj.R_mean[i],   obj.R_stdev[i],
obj.G_mean[i],   obj.G_stdev[i],
obj.area[i]])
outline =  '\t'.join(newline) + '\n'
out_file.write(outline)

out_file.close()

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Re: python-soappy

[tooper]

On the client side :
 from SOAPpy import SOAPProxy
 server= SOAPProxy("http://foo.bar.org:8090";)
 print server.Hello("world")

On the server side :
 from SOAPpy import SOAPServer

 def Hello(name):
return "Hello "+name+" !"

 server= SOAPServer(("localhost",8080))
 server.registerFunction(Hello)
 server.serve_forever()

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Re: - E04 - Leadership! Google, Guido van Rossum, PSF

[Anton Vredegoor]

Alex Martelli wrote:

> Anton Vredegoor <[EMAIL PROTECTED]> wrote:
>...
> > You are not my superior (or even considered to be more succesfull) as
> > you seem to imply.
>
> Depends on who does the considering, I'm sure.  If the considerer loves
> the English language, for example, a horrible mis-spelling such as
> "successfull" with two final L's would count for a lot in their judgment
> (English is neither your native language nor mine, so it's not unfair to
> either of us to consider it...;-).

Well this sums it all up for me, about you. Making stupid claims to
superiority while comfortably sitting at a computer *with a
spellchecker* and denying me the same priviliges, not even by
correcting google's _usenet_ interface (while its mail interface
includes at least a minimally functional editor/spellchecker) to the
point where a comparison would be fair. Stop whining and being
insulted, your elitist selection policies have far more worldwrecking
consequences than a few artificially magnified and misunderstood
'insults'.

Anton

'you could always join the dutch unemployment inquisition'

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Re: OT: Degrees as barriers to entry [was Re: - E04 - Leadership! Google, Guido van Rossum, PSF]

[A.M. Kuchling]

On Tue, 10 Jan 2006 23:13:01 +, 
Steve Holden <[EMAIL PROTECTED]> wrote:
> attempt to draw direct comparisons. Maybe having an uncle helped you in 
> to the trade, but it didn't cut you much slack in terms of required 
> standards, hence the absence of cathedral-shaped heaps of rubble. York 
> Minster was built in the 1400s, for example, and doesn't look like 
> falling down any time soon.

Googling for "cathedral collapse" finds an interesting page at
:

... As a matter of structural fact there is almost no argument
possible. The decay sensed by the eye after about 1250 stems
from a slow relaxation of the firm structural grasp that had
been acquired during the preceding hundred years.

...

Beauvais seems to have been particularly unfortunate. The apse
and choir were started in 1247, and finished in 1272. On 29
November 1284 the vault fell... Whatever the actual reason, it
was certainly believed at the time that the pier spacing was
too large, and the repairs over the next 50 years included the
intercalation of piers between these originally built for the
choir, so that the bays were halved from about 9m to about
4.5m. ...

--amk
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Re: Maximum List size (item number) limit?

[Juho Schultz]

[EMAIL PROTECTED] wrote:
> Juho Schultz
> 
>>NIR_mean_l only from lines 1, 4, 7, ...
>>R_mean_l only from lines 2, 5, 8, ...
>>G_mean_l only from lines 3, 6, 9, ...
> 
> 
> This can be the problem, but it can be right too.

I guess he is expecting 3000 elements, not 1000, as he wrote:

"And I noticed that all the lists that should contain 3000 items, 
contains less as follows:
NIR_mean_l = 1000 items"
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Re: Unicode & Pythonwin / win32 / console?

[Robert]

Martin v. Löwis schrieb:
> Robert wrote:
> win32ui.MessageBox(s)
> >
> > Traceback (most recent call last):
> >   File "", line 1, in ?
> > UnicodeEncodeError: 'ascii' codec can't encode characters in position
> > 12-16: ordinal not in range(128)
>
> Can't comment on that - this is a PythonWin issue.
>
> print s
> >
> > /devel/test\?.txt
> >
>
> I see. You need to do "chcp 1251" in your console first, for this
> to print this string correctly (and potentially also set the
> console font to Lucida Console).

is in a PythonWin Interactive session - ok results for cyrillic chars
(tolerant mbcs/utf-8 encoding!).
But if I do this on Win console (as you probably mean), I get also
encoding Errors - no matter if chcp1251, because cyrillic chars raise
the encoding errors also.
I think this is not a good behaviour of python to be so picky. In
[EMAIL PROTECTED] I showed, how I
solved this so far. Any better/portable idea?

> However, if you would do the same on a Russian Windows installation,
> the user will not need to change anything - cyrillic letters come
> out right. Likewise for Umlauts in a German windows installation,
> and Greek letters in a Greek installation.

Yes. But the original problem is, that occasionally unicode strings
(filenames in my case) arise which are not defined on the local
platform, but have to be displayed (in 'replace' - encoding-mode)
without breaking the app flow. Thats the pain of the default behaviour
of current python - and there is no simple switch. Why should "print
xy" not print something _always_ as good and as far as possible?

Robert

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Re: OT: Degrees as barriers to entry [was Re: - E04 - Leadership! Google, Guido van Rossum, PSF]

[Anton Vredegoor]

Steve Holden wrote:

> Consider yourself excused.

Thanks.

Anton

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Re: A bug for unicode strings in Python 2.4?

[Szabolcs Nagy]

> Thanks. I'll write my own split().

do you want to split character by character?
then use 
list(u'\u9019\u662f\u4e2d\u6587\u5b57\u4e32')

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how to improve this simple block of code

[py]

Say I have...
x = "132.00"

but I'd like to display it to be "132" ...dropping the trailing
zeros...I currently try this

if x.endswith("0"):
x = x[:len(x)-1]
if x.endswith("0"):
x = x[:len(x)-1]
if x.endswith("."):
x = x[:len(x)-1]

I do it like this because if
x = "132.15"  ...i dont want to modify it.  But if
x = "132.60" ...I want it to become "132.6"

is there a better way to do this?  It seems a bit ugly to me.

T.I.A
(thanks in advance)

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Re: New Python.org website ?

[Roy Smith]

Steve Holden <[EMAIL PROTECTED]> wrote:

> http://beta.python.org

All I can say is, "Wow!".  If nothing else, it will forever eliminate the 
idea that the web site doesn't look professional.  It's almost *too* slick.
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Re: New Python.org website ?

[Steve Holden]

Fuzzyman wrote:
> Now that is a very cool site.
> 
> I'm not very good with HTML - but can write content... I might see if
> there is something I can do.
> 
> All the best,
> 
> Fuzzyman
> http://www.voidspace.org.uk/python/index.shtml
> (and yes I do get referrals from these links...)
> 
Please note that one major rationale behind the new design is precisely 
becuase relatively few people *are* "good with HTML". Consequently Tim 
Parkin, the principal designer of the new architecture, has gone to 
great lengths to design a scheme that allows most of the authoring to be 
done in REstructured Text.

It's quite an legenat design, and if all you want to do is edit content 
rather than change layout it's *very* easy to use. Climb aboard!

regards
  Steve
-- 
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Holden Web LLC www.holdenweb.com
PyCon TX 2006  www.python.org/pycon/

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Re: how to improve this simple block of code

[Juho Schultz]

py wrote:
> Say I have...
> x = "132.00"
> 
> but I'd like to display it to be "132" ...dropping the trailing
> zeros...I currently try this
> 
> if x.endswith("0"):
> x = x[:len(x)-1]
> if x.endswith("0"):
> x = x[:len(x)-1]
> if x.endswith("."):
> x = x[:len(x)-1]
> 
> I do it like this because if
> x = "132.15"  ...i dont want to modify it.  But if
> x = "132.60" ...I want it to become "132.6"
> 
> is there a better way to do this?  It seems a bit ugly to me.
> 
> T.I.A
> (thanks in advance)
> 

x = x.rstrip('0') # removes trailing zeros
x = x.rstrip('.') # removes trailing dot(s)
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Re: how to improve this simple block of code

[py]

hanz wrote:
> x = x.rstrip('0.') # removes trailing zeroes and dots

knew there had to be a way, thanks.

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Re: try: except :

[Duncan Booth]

Tom Anderson wrote:

>> class NeverRaised(Exception):
>>def __init__(self, *args):
>>raise RuntimeError('NeverRaised should never be raised')
> 
> Briliant! Although i'd be tempted to define an
> UnraisableExceptionError to signal what's happened. Or ...
> 
> class ImpossibleException(Exception):
>   def __init__(self, *args):
>raise ImpossibleException, args
> 
> Although crashing the interpreter is probably overkill.

Crashng the interpreter would be, but what you just wrote is simply a more 
obscure way of raising RuntimeError :-)

>>> class ImpossibleException(Exception):
... def __init__(self, *args):
... raise ImpossibleException, args
...
>>> raise ImpossibleException
Traceback (most recent call last):
  File "", line 3, in __init__
RuntimeError: maximum recursion depth exceeded
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Re: (Fucking) Unicode: console print statement and PythonWin: replacement for off-table chars HOWTO?

[Robert]

Neil Hodgson schrieb:
> Robert:
> PythonWin did have some Unicode support but I think Mark Hammond was
> discouraged by bugs. In pythonwin/__init__.py there is a setting
> is_platform_unicode = 0 with a commented out real test for Unicode on
> the next line. Change this to 1 and restart and you may see
>
>  >>> x = u'sytest3\\\u041f\u043e\u0448\u0443\u043a.txt'
>  >>> print x
> sytest3\Пошук.txt
>  >>>

thanks for that hint. But found that it is still not consistent or even
buggy:

After "is_platform_unicode = ", scintilla displays some unicode
as you showed. but the win32-functions (e.g. MessageBox) still do not
pass through wide unicode. And pasting/inserting/parsing in scintilla
doesn't work correct:

PythonWin 2.3.5 (#62, Feb  8 2005, 16:23:02) [MSC v.1200 32 bit
(Intel)] on win32.
Portions Copyright 1994-2004 Mark Hammond ([EMAIL PROTECTED]) -
see 'Help/About PythonWin' for further copyright information.
>>> x = u'sytest3\\\u041f\u043e\u0448\u0443\u043a.txt'
>>> print x
sytest3\Пошук.txt
>>> print "sytest3\Пошук.txt"
sytest3\?.txt

!!!



Then tried in __init__.py to do more uft-8:

default_platform_encoding = "utf-8"  #"mbcs" # Will it ever ...this?
default_scintilla_encoding = "utf-8" # Scintilla _only_ supports this
ATM

Pasting around in scintilla then works correct. But MessageBox then
shows plain utf-8 encoded chars. Even german umlauts are not
displayable any more on my machine and when opening document files with
above-128 chars, Pythonwin breaks (because files are not valid utf-8
streams, I guess):

>>> Traceback (most recent call last):
  File
"C:\PYTHON23\Lib\site-packages\pythonwin\pywin\scintilla\document.py",
line 27, in OnOpenDocument
text = f.read()
  File "C:\Python23\lib\codecs.py", line 380, in read
return self.reader.read(size)
  File "C:\Python23\lib\codecs.py", line 253, in read
return self.decode(self.stream.read(), self.errors)[0]
UnicodeDecodeError: 'utf8' codec can't decode byte 0xa9 in position
19983: unexpected code byte
win32ui: OnOpenDocument() virtual handler (>) raised an exception


Thus the result is: no combination provides a real improvement so far.
wide unicode in win32-functions is obviously not possible at all.  I
switch back to the original setup.

Guess I have to create special C-code for my major wide unicode needs -
especially listctrl-SetItem and TextOut-Stuff...

Or does anybody know of some existing wide-unicode functions/C-code
parallel to normal pywin32?

Robert

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Re: New Python.org website ?

[Fuzzyman]

Content in ReST - iot ought to be using rest2web then. ;-)

Fuzzyman
http://www.voidspace.org.uk/python/rest2web/

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Re: New Python.org website ?

[Stefan Rank]

on 11.01.2006 11:44 Steve Holden said the following:
> 
> http://beta.python.org
> 

Very nice!

Just wanted to note that the content area and the menu area overlap 
(leaving some content unreadable)
in Opera 8.51 / WinXP

str

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for OpenOffice:how acces to file->properties->user defined without xml solution

[nicourjal]

is it possible to know user defined properties with python by dealing
with an object or something

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Re: Spelling mistakes!

[Mike Meyer]

Dennis Lee Bieber <[EMAIL PROTECTED]> writes:
> On Wed, 11 Jan 2006 06:57:06 +, Steve Holden <[EMAIL PROTECTED]>
> declaimed the following in comp.lang.python:
>> I suppose most readers aren't old enough to remember the punch card 
>> days, when you would hand your work in on coding sheets to the punch 
>> room and it would be punched onto cards using huge machines (anyone 
>> remember the 026 and 029 punches?).
>   FORTRAN and COBOL on 029s -- and had to submit the school ID card to
> check-out a drum; coding a drum card was actually taught in the COBOL
> class.

Pretty much everything on the 029. Like you, I had to punch things
myself. And had a drum card with one track for FORTRAN and a second
for ALGOL.

Of course, I was employed to work with them. At one point, I actually
"helped" someone do data processing with the card sorter.

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Re: python-soappy

[m.banaouas]

tooper a écrit :
> On the client side :
>  from SOAPpy import SOAPProxy
>  server= SOAPProxy("http://foo.bar.org:8090";)
>  print server.Hello("world")
> 
> On the server side :
>  from SOAPpy import SOAPServer
> 
>  def Hello(name):
>   return "Hello "+name+" !"
> 
>  server= SOAPServer(("localhost",8080))
>  server.registerFunction(Hello)
>  server.serve_forever()
> 
look at http://diveintopython.org/, Mark Pilgrim
there is a Python book including interesting chapter about SOAP.

While talking about SOAPpy module, I'm facing an authentication problem 
with it:

I'm consuming a WebServices server requiring authentication, and I did 
not found yet how to give authentication code (username:password) while 
calling any mehode of the webservice.

I did a temp trick around while waiting the *right* solution...

When authentication is not required , it works very well, and the 
automatic introspection is transparently handled by simple or imbriqued 
python types (sequences, etc. ...)
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Re: how to improve this simple block of code

[Matt Hammond]

On Wed, 11 Jan 2006 13:58:05 -, py <[EMAIL PROTECTED]> wrote:

> Say I have...
> x = "132.00"
>
> but I'd like to display it to be "132" ...dropping the trailing
> zeros...

How about:

   if "." in x:
 x, frac = x.split(".")
 frac = frac.rstrip("0")
 if frac:
 x = x + "." + frac


Copes if x = "132" too. If there'll always be a decimal point, then you  
can leave off the initial "if".



Matt
-- 

| Matt Hammond
| R&D Engineer, BBC Research & Development, Tadworth, Surrey, UK.
| http://kamaelia.sf.net/
| http://www.bbc.co.uk/rd/
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Re: Why keep identity-based equality comparison?

[Mike Meyer]

Antoon Pardon <[EMAIL PROTECTED]> writes:
> Op 2006-01-10, Mike Meyer schreef <[EMAIL PROTECTED]>:
>>> Now you can take the practical option and decide that programmatically
>>> it make no sense to compare a specific couple of values and throw an
>>> exception in this case, but it doesn't matter much which test you are
>>> conducting at that point.
>> Can you provide a case where having a test for equality throw an
>> exception is actually useful?
> I'm not going to bother with that.

Since you're being vague about what you want, and won't provide
examples to show why you want things to behave whatever way you want,
I can't really say much else about it.

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Re: Restart process with SIGHUP

[Mike Meyer]

[EMAIL PROTECTED] writes:
> I'm trying to restart a process with the os.kill command. My Problem is
> that if the command gets executed, my python script stops working. I
> want to SIGHUP a process with the following command: os.kill(pid,
> signal.SIGHUP).

That looks right.

> Can anyone give me a hint in solving this?

Not without knowing what the problem really is. Show us code. Show us
a traceback (best) or otherwise provide details about what "stops
working" means.

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Re: how to improve this simple block of code

[Mike Meyer]

"py" <[EMAIL PROTECTED]> writes:
> Say I have...
> x = "132.00"
> but I'd like to display it to be "132" ...dropping the trailing
> zeros...I currently try this

The two-strip solution is cleaner, but:

> if x.endswith("0"):
> x = x[:len(x)-1]
  x = x[:-1]
or
  del x[-1]

both improve that one statement.

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Re: (Fucking) Unicode: console print statement and PythonWin: replacement for off-table chars HOWTO?

[Thomas Heller]

"Robert" <[EMAIL PROTECTED]> writes:

>
> Guess I have to create special C-code for my major wide unicode needs -
> especially listctrl-SetItem and TextOut-Stuff...
>
> Or does anybody know of some existing wide-unicode functions/C-code
> parallel to normal pywin32?

You could use ctypes to access and call the ...W functions directly.

Thomas
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Re: Why keep identity-based equality comparison?

[Antoon Pardon]

Op 2006-01-11, Mike Meyer schreef <[EMAIL PROTECTED]>:
> Antoon Pardon <[EMAIL PROTECTED]> writes:
>> Op 2006-01-10, Mike Meyer schreef <[EMAIL PROTECTED]>:
 Now you can take the practical option and decide that programmatically
 it make no sense to compare a specific couple of values and throw an
 exception in this case, but it doesn't matter much which test you are
 conducting at that point.
>>> Can you provide a case where having a test for equality throw an
>>> exception is actually useful?
>> I'm not going to bother with that.
>
> Since you're being vague about what you want,

I would like some consistency. Either all comparisons between objects
of different types throw an exception by default or none does.

> and won't provide
> examples to show why you want things to behave whatever way you want,
> I can't really say much else about it.

Did you see examples that show why Guido wants things to behave whatever
way he wants? I didn't and I didn't see examples from you either.

Guido's idea is a change from current behaviour. Each time I saw some
argue a change here, people seem to expect a use case from that person.
So why ask a use case of me and just accepy Guido's idea.

-- 
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Re: - E04 - Leadership! Google, Guido van Rossum, PSF

[Christopher Subich]

Fredrik Lundh wrote:
>>TAG.did.you.just.call.me.a.kook.questionmark
> 
> 
> TAG.no.dash.but.if.you.keep.replying.to.them.all.the.time.i.may.have.to.plonk.you.too.smiley

TAG.you're.it.exclamation.point.
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Optimal Control Algorithms in Python

[aprasad21k]

Is anyone aware of Python code for Optimal Control Algorithms based on
Pontryagin's Maximum Principle? Thanks in advance for any leads on this.

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Re: how to improve this simple block of code

[Peter Otten]

Mike Meyer wrote:

> "py" <[EMAIL PROTECTED]> writes:
>> Say I have...
>> x = "132.00"
>> but I'd like to display it to be "132" ...dropping the trailing
>> zeros...I currently try this
> 
> The two-strip solution is cleaner, but:
> 
>> if x.endswith("0"):
>> x = x[:len(x)-1]
>   x = x[:-1]
> or
>   del x[-1]
> 
> both improve that one statement.

>>> del "it's tempting not to try"[-1]
Traceback (most recent call last):
  File "", line 1, in ?
TypeError: object doesn't support item deletion

Just-pointing-out-what-does-not-work-ly yours

Peter
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Re: Optimal Control Algorithms in Python

[[EMAIL PROTECTED]]

Not exactly but I am aware of Python code for nonlinear optimization
algorithms. Check the nlpy project at http://nlpy.sf.net It is
specifically targeted at finite-dimensional problems. However the
current trend in optimal control algorithms is to use grid-refinement
and iteratively solve finite-dimensional problems. You may thus find
nlpy useful. The missing part is the collocation/discretization part.
That may be available some place else.

Similarly, SciPy has some optimization algorithms ready for use but, as
far as I know, nothing for control.

Good luck,
Dominique

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Python script running as Windows service: Clean shutdown

[Stefan Krah]

Hello,

I'm trying to run a Python script as a Windows service with a defined
shutdown. The script (enigma-client.py) handles the communications with
the server in a distributed computing effort and calls a C program
(enigma.exe) to do the computations.

enigma.exe should save its current state when receiving SIGINT or SIGTERM.
This (obviously) works under Unix and also when running the script from the
Windows command line and terminating it with Ctrl-C.

I understand that for a clean shutdown of a Windows service one would
have to use the win32 extensions and have the working thread check
for the shutdown event in short intervals (<[EMAIL PROTECTED]>).


This would leave me with these options:

 a) Write enigma-client.py as a service. Write enigma.exe as a
service and have it poll regularly for shutdown events.

 b) Have enigma.exe save its state regularly, use srvany.exe
and forget about a graceful shutdown.


I'm new to Windows services, so I'd be grateful for corrections or
better solutions. Here is relevant part of the code (The whole thing
is at http://www.bytereef.org/enigma-client.txt ):



""" main """
cmdline = 'enigma.exe -R 00trigr.naval 00bigr.naval 00ciphertext > NUL'
eclient = Eclient()

if len(sys.argv) != 3:
eclient.usage()

if os.path.isfile(LOCKFILE):
print "enigma-client: error: found lockfile %s. \n" \
  "Check that no other enigma-client process is using this directory." \
  % LOCKFILE
sys.exit(1)

atexit.register(eclient.rm_lockfile)
eclient.touch_lockfile()

win32process.SetPriorityClass(
   win32process.GetCurrentProcess(),
   win32process.IDLE_PRIORITY_CLASS
)

while 1:
retval =  os.system(cmdline) >> 8
if retval == 0:
eclient.submit_chunk(sys.argv[1], int(sys.argv[2]))
eclient.get_chunk(sys.argv[1], int(sys.argv[2]))
elif retval == 1:
eclient.get_chunk(sys.argv[1], int(sys.argv[2]))
time.sleep(10)
else:
"""./enigma has caught a signal"""
sys.exit(retval)



Stefan Krah

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Re: New Python.org website ?

[Rocco Moretti]

Roy Smith wrote:
> Steve Holden <[EMAIL PROTECTED]> wrote:
> 
>>http://beta.python.org
> 
> All I can say is, "Wow!".  If nothing else, it will forever eliminate the 
> idea that the web site doesn't look professional.  It's almost *too* slick.

I agree with the "too slick" impression. The "learn why" pictures 
particularly unnerve me. It looks like a marketing team with a focus 
group got ahold of the website.

Great for reaching the PHB crowd. I'm not sure what J. Random Hacker 
will think though.
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RE: Change Gateway Programmatically

[Tim Golden]

[Godwin Burby]
| Subject: Re: Change Gateway Programmatically
| 
| Well netsh turned out to be the perfect solution for my problem(even
| though doing it in python would have given me some kicks).

Just in case you fancied an alternative approach, you can do
this with WMI.

(untested, because I don't want to mess up my gateway)

import wmi

c = wmi.WMI ()
nic = c.Win32_NetworkAdapterConfiguration (IPEnabled=True)[0]
print nic.DefaultIPGateway, nic.GatewayCostMetric
nic.SetGateways (DefaultIPGateway=["aaa.bbb.ccc.ddd"],
GatewayCostMetric=["20"])


TJG


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anti-virus service working around the clock, around the globe, visit:
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Re: Spelling mistakes!

[skip]

Steve> I suppose most readers aren't old enough to remember the punch
Steve> card days, when you would hand your work in on coding sheets to
Steve> the punch room and it would be punched onto cards using huge
Steve> machines (anyone remember the 026 and 029 punches?).

I do remember the IBM Model 29 punch card machines, though as a student
nobody was there to punch my cards or verify them for me...  :-(

Skip
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Re: New Python.org website ?

[Mike Meyer]

Stefan Rank <[EMAIL PROTECTED]> writes:

> on 11.01.2006 11:44 Steve Holden said the following:
>> http://beta.python.org
> Very nice!
> Just wanted to note that the content area and the menu area overlap
> (leaving some content unreadable)
> in Opera 8.51 / WinXP

Ditto for Opera 8.51 / OSX, and for Safari.

It's a problem with not handling users who need large fonts. I
recreated it in Mozilla by changing the minimum font size setting from
"None" to "20" (just a value I chose at random). I use Opera and
Safari on a day-to-day basis, and probably configured them
appropriately for my aging eyes.

Of course, this is typical on the web: "Works in IE" really means
"works in IE in the configurations we tested it for", and usually
means "works in our favorite configuration".

In particular, creating a good-looking design that remains readable in
all possible browser configurations is impossible. Getting one that is
readable in all reasonable browser configurations is hard, unless you
make your definition of "reasonable" very narrow.

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Re: MVC programming with python (newbie) - please help

[bwaha]

Well I read this in daylight hours. Talk about Enlightening!!!. It all
became clear. Now I even understand the point of an observer class, which
was shown in an example I posted back to the group from an earlier reply.

Thanks again for sharing your knowledge.

Be Well and Happy Always

Chris



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Re: New Python.org website ?

[Fuzzyman]

Steve Holden wrote:
> Fuzzyman wrote:
> > Now that is a very cool site.
> >
> > I'm not very good with HTML - but can write content... I might see if
> > there is something I can do.
> >
> > All the best,
> >
> > Fuzzyman
> > http://www.voidspace.org.uk/python/index.shtml
> > (and yes I do get referrals from these links...)
> >
> Please note that one major rationale behind the new design is precisely
> becuase relatively few people *are* "good with HTML". Consequently Tim
> Parkin, the principal designer of the new architecture, has gone to
> great lengths to design a scheme that allows most of the authoring to be
> done in REstructured Text.
>
> It's quite an legenat design, and if all you want to do is edit content
> rather than change layout it's *very* easy to use. Climb aboard!
>

Seriously though... I've downloaded the whole shooting match. It's not
*obvious* from trac what needs doing or who's working on what (although
I have yet to trawl through the SVN checkout).

I'd hate to start working on something, only to discover someone else
was already doing it...

All the best,

Fuzzyman
http://www.voidspace.org.uk/python/index.shtml

> regards
>   Steve
> --
> Steve Holden   +44 150 684 7255  +1 800 494 3119
> Holden Web LLC www.holdenweb.com
> PyCon TX 2006  www.python.org/pycon/

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PyConn--anyone needing roommates?

[Jeremy Moles]

There's a specific list, I believe, for this sort of question, but it
has been surprisingly quiet since I registered. :)

My employer has agreed to send me to PyConn this year (yay!) but I'm on
my own as far as roomage is concerned. If anyone needs another body--or
wants to find another body--I'm game. Anything to keep costs down is
good by me. :)

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Re: Cross Compile Mips / Linux

[Nick Craig-Wood]

[EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
>  Has anyone successfully built for Mips/Linux using a PC for the
>  build??, Should I try using a Linux based machine for the build,
>  would that help??

One thing you could try is to build a linux/mips file system image
(say debian which support mips) and run it with quemu on your PC.

  http://fabrice.bellard.free.fr/qemu/
  http://www.debian.org/ports/mips/

  MIPS R4K target Emulation
  Operating SystemState   Tested QEMU version
  GNU/Linux 2.6.14 Debian OK  0.8.0 

I've used a similar technique to cross build stuff for ARM.  I found
the debian ARM python quite sufficient for my needs so I didn't have
to build that!

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MVC in wxPython HELP!

[meonimarco]

Hi to all.
I woud implement MVC with wxPython. Is it possible? Is there anyone
that have experience in this?
The only correct example according to Observer Pattern that i  found on
web is not the formal implementation of MVC (is Document/View) and is
implemented with gtk...
How can i translate this gtk example in wx?
Does exist a tutorial, a archive of example or anything about MVC in
wx?
Thanks all!
Sorry for my "italian" english!

The gtk example that i talk about in my previous message is here:
http://www.pyj.it/sorgenti/2004/01/doc-view.zip

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Re: how to improve this simple block of code

[Gary Duzan]

py wrote:
> x = "132.15"  ...i dont want to modify it.  But if
> x = "132.60" ...I want it to become "132.6"
> 
> is there a better way to do this?  It seems a bit ugly to me.

The following works as long as you don't mind losing leading zeros 
as well:

x = x.strip('0')

Gary Duzan
Motorola CHS
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Re: MVC in wxPython HELP!

[Diez B. Roggisch]

[EMAIL PROTECTED] wrote:

> Hi to all.
> I woud implement MVC with wxPython. Is it possible? Is there anyone
> that have experience in this?
> The only correct example according to Observer Pattern that i  found on
> web is not the formal implementation of MVC (is Document/View) and is
> implemented with gtk...
> How can i translate this gtk example in wx?
> Does exist a tutorial, a archive of example or anything about MVC in
> wx?
> Thanks all!
> Sorry for my "italian" english!

The problem here is that MVC is not a "thing" (or class or whatever) that
can demonstrated once and for all, but a design concept for
GUI-applications.

You can do MVC in _all_ toolkits, and html, and even ncurses. Some toolkits
have "support" built-in in the way that their more complex widgets - like
tables or treeviews - expect a so-called model. That means that instead of
having e.g. a table-row-object that you add to a table and that you fill,
the table will query your model with an interface like this:

class TableModel:
   def __len__(self):
  

   def column_count(self):
  

   def get_value(self, row, column):
  


I have very limited experience with wx - but short googling reveals e.g. 

wx.lib.mvctree

Note the (Basic)TreeModel

Basically, you should try and look for wx(Python)-examples that use tree or
list widgets.

Regards,

Diez


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Re: Spelling mistakes!

[Hans Nowak]

Antoon Pardon wrote:

> Op 2006-01-10, Terry Hancock schreef <[EMAIL PROTECTED]>:
> 
>>In unit testing, you write the code, then write code to test
>>the code, which must correctly identify the methods in the
>>code. So you have to type 'everything' twice.
> 
> But you don't type attribute names twice in unit tests,
> because attributes are in general implementation details
> that are of no concern to the tester. So unit tests can
> not introduce the redundancy to find out a missed spelled
> attribute in some methods.

I wouldn't call attributes "implementation details", at least not in 
Python.  And while it is true that unit tests might not find the 
misspelling *directly* (i.e. you rarely test if you have misspelled 
something), your tests should definitely show unexpected behavior and 
results, if that attribute is of any importance.  Otherwise there's a 
loophole in your tests. :-)

-- 
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http://zephyrfalcon.org/
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ANN: Django 0.91 released

[Adrian Holovaty]

We're pleased to announce Django 0.91, the result of a month and a half
of feature additions, bug fixes, usability changes and other
improvements to the Django Web framework.

http://www.djangoproject.com/

There are literally hundreds of improvements since version 0.90 -- but
some of the most notable are:

* Merged the "new-admin" branch, which heavily refactored the way
the admin works, to make it more extensible.

* Changed passwords to be stored with a salt, and with a tighter
(and swappable) encryption algorithm.
http://www.djangoproject.com/weblog/2005/nov/20/passwordchange/

* URLconfs no longer require named groups; you can use simple
parentheses. http://www.djangoproject.com/weblog/2005/nov/28/urls/

* Changed the default project layout to add a manage.py utility,
which avoids frustration with DJANGO_SETTINGS_MODULE.

* Added a gorgeous template-debugging error page in the case of
template syntax errors.
http://www.djangoproject.com/weblog/2005/nov/23/template_errors/

* Added an {% include %} template tag.
http://www.djangoproject.com/documentation/templates/#include

* Added a framework for template context processors.
http://www.djangoproject.com/documentation/templates_python/#subclassing-context-djangocontext

* Improved the e-mail library to prevent header injections.
http://www.djangoproject.com/documentation/email/#preventing-header-injection

* Added OR lookups to the database API.
http://www.djangoproject.com/weblog/2005/nov/30/or/

* Made the template system scoped to the parser instead of the
template module. Also changed the way tags/filters are registered and
added support for multiple arguments to the {% load %} tag.

In addition to the many, many changes, we've reworked the tutorial to
simplify things -- namely using the new manage.py utility instead of
futzing with the Python path and environment variables.
http://www.djangoproject.com/documentation/tutorial1/

Many thanks to all the great people who've contributed to this project.
You can check them out in the AUTHORS file:
http://code.djangoproject.com/browser/django/trunk/AUTHORS


About Django


Django is a high-level Python Web framework that encourages rapid
development and clean, pragmatic design. It lets you write high-quality
Web apps very quickly, with very little code.

It gives you:

* An object-relational mapper, which currently works with PostgreSQL,
MySQL and SQLite. (Oracle and MS-SQL support are coming.) This lets you
query databases in Python; there's no need to write SQL if you don't
want to.

* A template system.

* A beautiful, production-ready admin interface -- for free.

* Full internationalization (i18n) support.

* A super-cool community!

* An RSS/Atom-producing framework.

* Tons of other niceties, such as generic views (which abstract common
Web-development patterns), based on several years' worth of solving
Real Problems in the Real World.

Enjoy!

The Django team

--
Adrian Holovaty
holovaty.com | djangoproject.com | chicagocrime.org

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Re: MVC in wxPython HELP!

[snoe]

See this recent explanation by has:
http://groups.google.ca/group/comp.lang.python/msg/f8990a2c666a793c?hl=en&;
(The rest of the thread may lead you to more concrete examples as well.)

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Re: Why keep identity-based equality comparison?

[Mike Meyer]

Antoon Pardon <[EMAIL PROTECTED]> writes:
> Op 2006-01-11, Mike Meyer schreef <[EMAIL PROTECTED]>:
>> Antoon Pardon <[EMAIL PROTECTED]> writes:
>>> Op 2006-01-10, Mike Meyer schreef <[EMAIL PROTECTED]>:
> Now you can take the practical option and decide that programmatically
> it make no sense to compare a specific couple of values and throw an
> exception in this case, but it doesn't matter much which test you are
> conducting at that point.
 Can you provide a case where having a test for equality throw an
 exception is actually useful?
>>> I'm not going to bother with that.
>> Since you're being vague about what you want,
> I would like some consistency. Either all comparisons between objects
> of different types throw an exception by default or none does.

That's a very silly thing to ask for. It presumes that all types are
the same. They aren't. It also presumes that all comparisons are the
same. They aren't. To use an overworked analogy, you might as well ask
that you either have to peel all fruit, or that you never have to peel
a fruit.

In any case, the proposeed behavior *is* consistent. The behavior for
all builtin types will be that comparisons that don't make sense will
throw exceptions. Since we're talking about Py3K here, there is no
"default" behavior. User-defined classes all inherit from builtin
types, and will get the behavior of their comparison operators from
those types. In particular, those that inherit from object will get
objects behavior, which means they'll get equality as identity.

>> and won't provide
>> examples to show why you want things to behave whatever way you want,
>> I can't really say much else about it.
> Did you see examples that show why Guido wants things to behave whatever
> Guido's idea is a change from current behaviour. Each time I saw some
> argue a change here, people seem to expect a use case from that person.
> So why ask a use case of me and just accepy Guido's idea.

For one thing, Guido has a long history of doing excellent Python
design work. For another, this issue was thrashout out at length in
comp.lang.python some years ago. What Guido proposed is inline with
the conclusions of those discussions.

  http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.
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How can I determine an HTTPMessage ?

[Kevin]

Can you tell me what to look for in an HTTPMessage that is an error?  I
have looked at the header objects and I cannot determine an error
message.

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Re: how to improve this simple block of code

[Matt Hammond]

> How about:
>
>if "." in x:
>  x, frac = x.split(".")
>  frac = frac.rstrip("0")
>  if frac:
>  x = x + "." + frac

Or simpler still:

 if "." in x:
 x = x.rstrip("0")
 x = x.rstrip(".")


More concise, but slightly less readable IMO:

 if "." in x:
 x = x.rstrip("0").rstrip(".")

-- 

| Matt Hammond
| R&D Engineer, BBC Research & Development, Tadworth, Surrey, UK.
| http://kamaelia.sf.net/
| http://www.bbc.co.uk/rd/
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Re: MVC in wxPython HELP!

[Scott David Daniels]

[EMAIL PROTECTED] wrote:
> Hi to all.
> I woud implement MVC with wxPython. Is it possible? Is there anyone
> that have experience in this?
> The only correct example according to Observer Pattern that i  found on
> web is not the formal implementation of MVC (is Document/View) and is
> implemented with gtk...
> How can i translate this gtk example in wx?
> Does exist a tutorial, a archive of example or anything about MVC in
> wx?
> Thanks all!
> Sorry for my "italian" english!
> 
> The gtk example that i talk about in my previous message is here:
> http://www.pyj.it/sorgenti/2004/01/doc-view.zip
> 
Can I just suggest you search in Google Groups for the message by
"has" labelled "Re: MVC programming with python (newbie) - please help".
Dated: 7 Jan 2006 07:03:04 -0800.  It is one of the nicest short
descriptions of the MVC pattern and why it works.

The link I have is huge, but:
 http://groups.google.com/group/comp.lang.python/browse_thread/
   thread/eb0be1531e010273/
   9b80e79d4706200d?tvc=2&q=MVC+daniels#9b80e79d4706200d

I've inserted returns at two points in the url directly after slashes,
drop tose returns and the associated spaces.

--Scott David Daniels
[EMAIL PROTECTED]
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Memory Profiler

[Dave]

Hi,

Is there any memory profiler for Python programs? I
would like to see how much memory objects take up,
cache misses, etc. I tried to patch PySizer, but got a
build error (Error 138). 

Thanks!

__
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
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Re: exec a string in an embedded environment

[Graham Fawcett]

Tommy R wrote:
> I need some way to execute a string and pass arguments to the functions
> inside the string. We have discussed a solution where we first load the
> string (containing some funcs) and then run something similar to
> Py_RunString("foo(1.0, 'str')");  We need to do this in a generic way
> so we can send in arbitrary arguments.

You could use

foo_ptr = Py_RunString("foo", Py_eval_input, globals_ptr,
locals_ptr)

to get a reference to the foo function, and then use

result_ptr = PyObject_Call(foo_ptr, args_ptr, kwargs_ptr)

to call it with arbitrary arguments and keyword arguments. Of course,
you're responsible for setting up the globals and locals, as well as
the args list and kwargs dictionary objects.

The PyObject_Call signature, from , is:

 PyAPI_FUNC(PyObject *) PyObject_Call(PyObject *callable_object,
 PyObject *args, PyObject *kw);

Does this help?

Graham

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Re: Memory Profiler

[Grig Gheorghiu]

See

http://pycheesecake.org/wiki/PythonTestingToolsTaxonomy#MiscellaneousPythonTestingTools

In particular, PySizer and HeapPy might be what you're looking for. I
can't say for sure, since I haven't used these tools myself.

Grig

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Problems with WX and program loop...

[Mr BigSmoke]

Hi everybody... I have an app that has to controll some ascii files
every 10/30 seconds... I was planning to have an GUI using wxpython.
The problems is that i wasn't able to manage my application loop and
the wxApp loop, so my interface is always freezing...
My app do something like this:
- creates a new wx and wxframe instance
- loads some configuration info
- starts looping every 30 seconds (while True: sleep(30); do something,
bla,bla)
- update some labels and textboxes on my frame...

On every loop step, if i find some info in those ascii files i want to
change some labels on my wxFrame... But my frame just freezes...
because of the loop.

Any hint?

I'll post some of the code down here...

"
...
loadSystemConfiguration() # Carico la configurazione delle tag
dell'intero sistema
self.loadMonitorConfiguration() # Carico le configurazioni del
monitor
# monitorGUI.monitorGUI is my wxFrame class...
self.mG = monitorGUI.monitorGUI(None, app_path, screen_dx=1024,
screen_dy=768)
self.mG.Show()

self.monitorize = True
while self.monitorize:
time.sleep(30)
<<>>
if something:
  self.mG.status.SetValue("Registering new event...")
  self.mG.Update()

"

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Re: OT: Degrees as barriers to entry [was Re: - E04 -Leadership!Google, Guido van Rossum, PSF]

[Fredrik Lundh]

Richard Brodie wrote:

> > Wrong [see above]. I don't remember many mediaeval cathedrals falling down.
>
> Your memory of medieval times has gone a bit hazy I expect

probably because he was hit in the head by a falling stone during a trip to 
southern
france, many years ago.





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The effbot does not exist!

[David Murmann]

http://effbot.org/F

;)
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Re: New Python.org website ?

[rzed]

Steve Holden <[EMAIL PROTECTED]> wrote in
news:[EMAIL PROTECTED]: 

> Bugs wrote:
>> Aahz wrote:
>> 
>>>Dunno about "in time for the new year", but there is a new
>>>design that is supposedly in final stages of getting
>>>implemented.  What's your hurry? 
>> 
> [...]
> http://beta.python.org
 
So what's the character encoding? I haven't found (WinXP Firefox) 
that displays that city in Sweden without a paragraph symbol or 
worse. 

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Re: how to improve this simple block of code

[Peter Hansen]

py wrote:
> hanz wrote:
>>x = x.rstrip('0.') # removes trailing zeroes and dots
> 
> knew there had to be a way, thanks.

But that's not it. :-)

This is a wonderful opportunity for you to learn about unit testing, and 
begin the long process of developing good testing habits.  Of all the 
ideas posted, I believe only Mark Hammond's would correctly pass the 
basic obvious test cases, and I don't think anyone (without actually 
having checked with tests) should be saying even his is clearly correct.

import unittest
from yourmodule import stripZeros  # or whatever you have

class Tests(unittest.TestCase):
 def test01(self):
 'check zero-stripper'
 for input, expected in [
 ('', ''),
 ('0', '0'),
 ('0.0', '0'),
 ('0.', '0'),
 ('000.', '000'),
 ('10', '10'),
 ('10.0', '10'),
 ('foo', 'foo'),
 ('foo.', 'foo'), # ??
 ('132.15', '132.15'),
 ('132.60', '132.6'),
 ('132.00', '132'),
 ('132.0', '132'),
 ('132.01', '132.01'),
 # add others to taste
 ]:
 self.assertEquals(expected, stripZeros(input))

unittest.main()


Change the above test cases to match what you really want if they're not 
correct, then run the script and make sure everything passes.

-Peter

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Python Scripts to logon to websites

[BartlebyScrivener]

New to Python and Programming. Trying to make scripts that will open
sites and automatically log me on.

The following example is from the urllib2 module.

What are "realm" and "host" in this example.

import urllib2
# Create an OpenerDirector with support for Basic HTTP
Authentication...
auth_handler = urllib2.HTTPBasicAuthHandler()
auth_handler.add_password('realm', 'host', 'username', 'password')
opener = urllib2.build_opener(auth_handler)
# ...and install it globally so it can be used with urlopen.
urllib2.install_opener(opener)
urllib2.urlopen('http://www.example.com/login.html')

Does anyone have a simple example of a script that opens, say, gmail or
some other commonly accessed site that requires a username and password
so that I can see how one is made?

Thanks very much for any help.

rpd

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Re: for OpenOffice:how acces to file->properties->user defined without xml solution

[Peter Hansen]

[EMAIL PROTECTED] wrote:
> is it possible to know user defined properties with python by dealing
> with an object or something

Have you investigated the Python interface to the OpenOffice APIs?  I 
don't recall the name offhand, but I'm sure Googling for "python 
openoffice" would tell you.

If you are in fact using that already, please clarify your question in 
that context since it's obviously crucial to giving you a useful answer.

-Peter

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Re: Why keep identity-based equality comparison?

[Steven Bethard]

Mike Meyer wrote:
> Steven Bethard writes:
> 
>> Not to advocate one way or the other, but how often do you use
>> heterogeneous containers?
> 
> Pretty much everything I do has heterogenous containers of some sort
> or another.

Sorry, I should have been a little more specific.  I meant heterogeneous 
containers where you've used the "in" operator.

> SQL queries made to DP API compliant modules return
> homogenous lists of heterogenous containers. The cgi module turns the
> request string into a dictionary-like container of objects with values
> of different types.

Are the keys of different types too?  Because if the keys are all the 
same types, then using the "in" operator here wouldn't raise an 
exception.  Unless, of course, you used the "in" operator on the 
.values() of the dictionary...

> The last thing I did that was both more than a script and didn't use
> either a database or a web front end was (IIRC) a media player for
> multiple media types. It revolved around lists of things to play, and
> the "things" in question could be any "playable" object - video or
> audio files, track on a CD, or a DVD, or even a playlist.

That seems pretty reasonable.  Your code used the "in" operator with 
these lists?

> Come to think of it, recursive data structures of this type - a
> container that contains a heterogenous list of things, possibly
> including instances of the container type itself - are pretty
> common.

Sure.  I have a number of tree-like containers, and in at least a few 
implementations, BranchNode and LeafNode are different classes.  But I 
haven't needed the "in" operator with these.  With the 
raise-exceptions-between-objects-of-different-types proposal, it would 
probably raise an exception if you tried, but I can't decide whether 
that's a good or a bad thing...

> The other proposal - if I have it right - would not change the
> behavior of equality comparisons between objects of the same class,
> but would make comparisons between objects of different classes raise
> an exception instead of returning false by default.

Perhaps, given duck-typing, a better proposal would be to raise an 
exception if the objects have different interfaces.  Of course, at the 
moment, I can't think of any even vaguely efficient way of checking 
that. ;-)

STeVe
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How do initial login/password before can download web file with urllib?

[[EMAIL PROTECTED]]

I finally figured out how to use the wonderful module urllib to
download files.

What if web page requires you to fill out a form with login and
password first?

Is this just like any other FORM?  Can login/password from a GET method
form be handled by appending something like "?login=foo,password=bar"
to URL?

Is that right way?

Chris

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batch tiff to jpeg conversion script

[[EMAIL PROTECTED]]

Hope it's not inappropriate to post this here.

Could someone critique my code? I have no Python programmers in my
office to show this to. The script works OK, but should I do it
differently? I especially don't like how I check to see if jpegs exist.

The style may not be acceptable to some, but I'm concerned with
substance, not style. Is there a 'more appropriate' way to do this?

Thanks to all who take the time to give advice!

-
import os
import os.path
#From PIL
import Image

def tiff_to_jpeg(path):

for root, dirs, files in os.walk(path):
for f in files:
if os.path.splitext(os.path.join(root,f))[1].lower() ==
".tif":

# If a jpeg is already present. Don't do anything.
if
os.path.isfile(os.path.splitext(os.path.join(root,f))[0] + ".jpg"):
print "A jpeg file already exists for %s" %f

# If a jpeg is *NOT* present, create one from the tiff.
else:
outfile = os.path.splitext(os.path.join(root,f))[0]
+ ".jpg"
try:
im = Image.open(os.path.join(root,f))
print "Generating jpeg for %s" %f
im.thumbnail(im.size)
im.save(outfile, "JPEG", quality=100)
except Exception, e:
print e

# Run Program
path = '.'
tiff_to_jpeg(path)

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Re: How can I determine an HTTPMessage ?

[Peter Hansen]

Kevin wrote:
> Can you tell me what to look for in an HTTPMessage that is an error?  I
> have looked at the header objects and I cannot determine an error
> message.

I think you're missing most of the context and detail that would help us 
provide a useful answer for you.

Think about it from a reader's point of view.  We don't know what 
packages you are using, we don't know what you mean by "HTTPMessage" (is 
it a specific class, or is it just how you refer to the more generic 
"HTTP message" entity?), we don't know what version of anything you are 
using or what platform you're on.

-Peter

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Re: How do initial login/password before can download web file with urllib?

[Peter Hansen]

[EMAIL PROTECTED] wrote:
> I finally figured out how to use the wonderful module urllib to
> download files.
> 
> What if web page requires you to fill out a form with login and
> password first?
> 
> Is this just like any other FORM?  Can login/password from a GET method
> form be handled by appending something like "?login=foo,password=bar"
> to URL?
> 
> Is that right way?

If by "the URL" you mean the one that was used to retrieve the page in 
the first place, then the answer is "not necessarily, and rarely". 
Generally you need to parse the FORM and use its "action" attribute as 
the URL, plus whatever form fields are required.  It might be just login 
and password, but the choice of names is form-specific and there may be 
other (even hidden) fields that are required.  Tools such as 
http://wwwsearch.sourceforge.net/mechanize/ can help you with this.

-Peter

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Re: How do initial login/password before can download web file withurllib?

[Fredrik Lundh]

[EMAIL PROTECTED] wrote:

> I finally figured out how to use the wonderful module urllib to
> download files.
>
> What if web page requires you to fill out a form with login and
> password first?

the examples section shows how to encode form data for either GET
or POST requests:

http://www.python.org/doc/current/lib/node483.html

(look at the page sources to see what the server wants you to use:
http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.1 )





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Re: how to improve this simple block of code

[Peter Otten]

Peter Hansen wrote:

> Of all the ideas posted, I believe only Mark Hammond's would correctly 
> pass the basic obvious test cases 

Too bad he didn't post at all :-)

Peter

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Re: How can I test if an argument is a sequence or a scalar?

[Russell E. Owen]

In article <[EMAIL PROTECTED]>,
 [EMAIL PROTECTED] wrote:

>I want to be able to pass a sequence (tuple, or list) of objects to a
>function, or only one.
>
>It's easy enough to do:
>
>isinstance(var, (tuple, list))
>
>But I would also like to accept generators. How can I do this?
>
>Anything else is assumed to be a single value (my fault if I pass a
>dict or something else to the function) and I make it into a tuple with
>a single value (var, ) in order to simplify the algorithm (wasn't there
>a special name for a one item tuple? Its been a while since I've
>programmed in Python.)
>
>Is there an easy way to do that?

Here is the code I use for that purpose, but it does not handle 
generators or iterators. You could easily combine this with code 
suggested in other replies to accomplish that. (I intentionally excluded 
iterators because I didn't need them and they can be unbounded. Still, 
now that they are so widely used it may be worth reconsidering.)

def isSequence(item):
"""Return True if the input is a non-string sequential collection,
False otherwise. Note: dicts and sets are not sequential.
"""
try:
item[0:0]
except (AttributeError, TypeError):
return False
return not isString(item)

def isString(item):
"""Return True if the input is a string-like sequence.
Strings include str, unicode and UserString objects.

From Python Cookbook, 2nd ed.
"""
return isinstance(item, (basestring, UserString.UserString))

def asSequence(item):
"""Converts one or more items to a sequence,
If item is already a non-string-like sequence, returns it unchanged,
else returns [item].
"""
if isSequence(item):
return item
else:
return [item]

I then use asSequence on each argument that can either be one item or a 
sequence of items (so I can always work on a sequence).

-- Russell

P.S. this code is from RO.SeqUtil 

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Re: Python Scripts to logon to websites

[Peter Hansen]

BartlebyScrivener wrote:
> New to Python and Programming. Trying to make scripts that will open
> sites and automatically log me on.
> 
> The following example is from the urllib2 module.
> 
> What are "realm" and "host" in this example.

http://www.ietf.org/rfc/rfc2617.txt probably provides more background 
than you want on that topic, but googling for "basic authentication" and 
maybe "realm" and/or "host" will find you other sites with less 
technically detailed material.  The first hit has a little summary 
amidst some Apache-specific detail.

> Does anyone have a simple example of a script that opens, say, gmail or
> some other commonly accessed site that requires a username and password
> so that I can see how one is made?

"realm" and "host" are associated with "basic authentication" and not 
all sites use that.  If the browser pops up a little dialog box of its 
own (i.e not some Javascript-triggered thing) and you have to enter your 
username and password there, that's probably a "basic auth" (or "digest 
auth") site.  If you fill that info into a form (as on gmail.com) you 
don't want any of that "realm/host" stuff.

I'll leave it to others more expert in this to provide a more directly 
useful answer.

-Peter

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Re: Problems with WX and program loop...

[Chris Mellon]

On 11 Jan 2006 10:33:08 -0800, Mr BigSmoke <[EMAIL PROTECTED]> wrote:
> Hi everybody... I have an app that has to controll some ascii files
> every 10/30 seconds... I was planning to have an GUI using wxpython.
> The problems is that i wasn't able to manage my application loop and
> the wxApp loop, so my interface is always freezing...
> My app do something like this:
> - creates a new wx and wxframe instance
> - loads some configuration info
> - starts looping every 30 seconds (while True: sleep(30); do something,
> bla,bla)
> - update some labels and textboxes on my frame...
>
> On every loop step, if i find some info in those ascii files i want to
> change some labels on my wxFrame... But my frame just freezes...
> because of the loop.
>
> Any hint?
>
> I'll post some of the code down here...
>

Welcome to the exciting world of event-based programming ;)

You want to use a wx.Timer to trigger your event every 30 seconds
instead of sleeping.



> "
>
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>
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Re: Reading from input file.

[paczkow]

I do not clearly understand what you say.

I am no going to change input files in anyway. I just want to read them
with Python, and postprocess.

I understand:
open(inputfile.txt, 'r').read()
However what you mean saying split the string using '\n'. Where should
I put it? After file name, or what? Sorry, but I am still learing
Python.

Looking forward hearing from you,

Regards

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Re: Reading from input file.

[paczkow]

I do not clearly understand what you say.

I am no going to change input files in anyway. I just want to read them
with Python, and postprocess.

I understand:
open(inputfile.txt, 'r').read()
However what you mean saying split the string using '\n'. Where should
I put it? After file name, or what? Sorry, but I am still learing
Python.

Looking forward hearing from you,

Regards

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Programming Eclipse plugins in Jython?

[Kenneth McDonald]

Is it easy or difficult to implement Eclipse plugins in Jython? And  
if the former, are there any starter's guides you could recommend?

The desire is an editor plugin for a syntactically very simple  
proprietary language. I'd like to have paren checking, syntax  
colorization and (to start with at least) a few other small features.  
Unfortunately, there's quite a hump in learning the Eclipse API well  
enough to do even simple things (or at least that's what my reading  
seems to indicate), and I was wondering if I can cheat and use Jython  
to simplify the process.

Thanks,
Ken
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Re: batch tiff to jpeg conversion script

[Larry Bates]

[EMAIL PROTECTED] wrote:
> Hope it's not inappropriate to post this here.
> 
> Could someone critique my code? I have no Python programmers in my
> office to show this to. The script works OK, but should I do it
> differently? I especially don't like how I check to see if jpegs exist.
> 
> The style may not be acceptable to some, but I'm concerned with
> substance, not style. Is there a 'more appropriate' way to do this?
> 
> Thanks to all who take the time to give advice!
> 
> -
> import os
> import os.path
> #From PIL
> import Image
> 
> def tiff_to_jpeg(path):
> 
> for root, dirs, files in os.walk(path):
> for f in files:
> if os.path.splitext(os.path.join(root,f))[1].lower() ==
> ".tif":
> 
> # If a jpeg is already present. Don't do anything.
> if
> os.path.isfile(os.path.splitext(os.path.join(root,f))[0] + ".jpg"):
> print "A jpeg file already exists for %s" %f
> 
> # If a jpeg is *NOT* present, create one from the tiff.
> else:
> outfile = os.path.splitext(os.path.join(root,f))[0]
> + ".jpg"
> try:
> im = Image.open(os.path.join(root,f))
> print "Generating jpeg for %s" %f
> im.thumbnail(im.size)
> im.save(outfile, "JPEG", quality=100)
> except Exception, e:
> print e
> 
> # Run Program
> path = '.'
> tiff_to_jpeg(path)
> 
The methodology seems just fine.  You may (or may not) find
the following code easier to read (not tested):

for f in [file for file in files if file.lower().endswith('.tif')]:
# If a jpeg is already present. Don't do anything.
filename, extension=f.split('.')
jpgfile="%s.jpg" % filename
jpgpath=os.path.join(root, jpgfile)
# If a jpeg is *NOT* present, create one from the tiff.
if not os.path.isfile(jpgpath):
try:
im = Image.open(os.path.join(root,f))
print "Generating jpeg for %s" % f
im.thumbnail(im.size)
im.save(jpgpath, "JPEG", quality=100)
 except Exception, e:
print e

 continue

print "A jpeg file already exists for %s" % f


This code:

1) only processess .tif files
2) simplifies things by eliminating the splitext methods and
   slicing operations.
3) eliminates else branch

-Larry Bates
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