[Q] Is there a way to minimize a Tkinter application to the system tray?

[Thomas Ploch]

Hello folks,

I already found some answers on the net, which said that the Tk library 
that Tkinter wraps does not offer functionality to minimize an 
application to the system tray.

But I hope there are some wizards in here that might tell me that how 
it (possibly) could be done.

Thomas

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Re: os.path.basename() - only Windows OR *nix?

[Thomas Ploch]

Bruno Desthuilliers schrieb:
> 
> Let me guess : your cgi script is running on *n*x ?-)
> 

Pretty hard to get this one, heh? :-D

> 
> Probably.

Good that you decided I was worth the information.

>  >>> fnames = "C:\\dir\\data.ext", "/dir/data.txt", "dir:data"
>  >>> import ntpath, posixpath, macpath
>  >>> def basename(filename):
> ... for m in ntpath, posixpath, macpath:
> ... if m.sep in filename:
> ... return m.basename(filename)
> ... else:
> ... # XXX
> ... raise SomeException('could not do the job')
> ...
>  >>> for f in fnames:
> ... print f, basename(f)
> ...
> C:\dir\data.ext data.ext
> /dir/data.txt data.txt
> dir:data data
>  >>>
> 

Thnaks a lot. :)

Thomas

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Re: os.path.basename() - only Windows OR *nix?

[Thomas Ploch]

Steve Holden schrieb:
> Clearly if form['uploadfile'] is returning the client's path information 
> you do have to remove that somehow before further processing, which also 
> means you need to deduce what the client architecture is to correctly 
> remove path data. Of course this also leaves open the question "what 
> does a Mac client return?", and you might want to cater for that also.

I tested from linux and Mac OS, and on both os.path.basename() works as
expected (since the server it runs on is a UNIX one). That brings me to
the question, how Do I a) get the cients architecture and b) send the
architecture of the client through cgi.FieldStorage()?

> I suspect you will also find that there are at least some circumstances 
> under which a Unix browser will also include path information.

Which ones should that be? Since os.path.basename() _is_ doing the right
thing on *nix style paths (Mac OS is not different there), I cant think
of other circumstances.


> I presume you are looking to use the same filename that the user 
> provided on the client? Does this mean that each user's files are 
> stored in different directories? Otherwise it's not always a good idea 
> to use filenames provided by the user for files on the server anyway.

Yes, each User has his own directory. Files get timestamped and then put
into the corresponding directory. It is just that having
'C:\a\very\long\path\file.ext' as a filename on the server is not nice.

Thomas

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os.path.basename() - only Windows OR *nix?

[Thomas Ploch]

Hello,

I have a cgi script that handles fileuploads from windows and *nix
machines. i need os.path.basename(filename) to get the pure filename.

For *nix, thats not a problem, but for windows, it always returns the
full path:



#/usr/bin/env python

import cgi, os
import cgitb; cgitb.enable()

form = cgi.FieldStorage()
filename = os.path.basename(form['uploadfile'].filename)

print 'Content-Type: text/html\n\n'
print filename



-

For 'C:\text\text.txt', the output is 'C:\text\text.txt', which should
be 'text.txt', the same happens for 'C:\\text\\text.txt'. I think its
the escapes that makes python not splitting it. All Unix style paths get
converted the right way.

Is there an easy way around this, or do I really have to write a parser
including _all_ Python escapes?

Thomas
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Re: Device Drivers in python(kernel modules)

[Thomas Ploch]

rishi pathak schrieb:
> I am not much of a kernel programmer , I have a requirement to shift a
> python code to work as a kernel module.
> So I was just wondering whether we can write a kernel module in python.
> A thought is that if we can somehow convert python code into a C object
> code then it can be done.
> Can some one suggest something..anything

http://wiki.python.org/moin/elmer

This tool is able to run Python Code as if it was written in C.
Perhaps this might help you, but I am not pretty sure since it had to be
included in the kernel tree.

Thomas

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Which Object Database would you recommend for cross platform application?

[Thomas Ploch]

Hello folks,

I am currently developing an open source Event Managment software 
(events in real-life, like concerts, exhibitions etc. :-) ) using wx for 
the GUI, and I need an Object database. Since this is the first time I 
actually need doing this, I wondered if anybody here could recommend 
one. It can be fairly simple. It doesn't need threading support and will 
only host one client (the application, but I am thinking about making 
this database accessible via the web, but this is still far in the 
future), although the database might get big (around 1GiB). It should be 
available for linux, mac os and windows.

I looked into ZODB, but thats totally overloaded for my purpose. I 
looked into Durus (a re-implementation of ZODB, but without this 
overloaded stuff, but the documentation is very thin). Both of them 
don't really appeal.

So I wondered if any of you could recommend one that (more or less) best 
fits the described conditions.

Thanks in advance,
Thomas
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Re: Rational Numbers

[Thomas Ploch]

Simon Brunning schrieb:
> On 12 Jan 2007 15:55:39 GMT, Nick Maclaren <[EMAIL PROTECTED]> wrote:
>> In article <[EMAIL PROTECTED]>,
>> Carsten Haese <[EMAIL PROTECTED]> writes:
>> |> but there are more use
>> |> cases for Decimal than for Rational.
>>
>> That is dubious, but let's not start that one again.
> 
> Decimals are good for holding financial values. There's a whole lot of
> software out there that deals with money.
> 

Do not forget:

- Time
- Personal Data (like birthdays, age)

Thomas
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Re: Question: Best Practice? (module 'shelve')

[Thomas Ploch]

Thomas Ploch schrieb:
> Hello fellows,
> 
> I just wanted to know, if there is any best practice concerning
> following code:
> 
> import re, shelve
> 
> class TextMatcher:
> def __init__(self, patterns, email=False, dbName='textmatch.db'):
> self._initPatterns(patterns)
> self.email = email
> self.dbName = dbName
> if self.email:
> self.emailList = []
> self.emailList.append(
>   re.compile(r'[EMAIL PROTECTED]'))
> 
> def match(self, src, url):
> self.matchDict = {}
> self.matchDict[url] = {}
>   # The next 2 functions just add stuff to self.matchDict
> if self.email:
> self._addEmails(src, url)
> self._addPatterns(src, url)
>   # Is it good practice to open, write and close the db straight
>   # away? Or is it better to leave it open until the whole program
>   # has finished, and close it then?
> self.openDB(self.dbName)
> self.db[url] = self.matchDict[url]
> self.db.close()
>   # I want to del the matchDict each time so it can't grow big.
>   # Is this good, or should it be left open, too?
> del self.matchDict
> 
> def openDB(self, dbName=None, modeflag='c'):
> if dbName == None:
> self.db = shelve.open('textmatch.db', flag=modeflag)
> else:
> self.db = shelve.open(dbName, flag=modeflag)
> 
> 

s/del self.matchDict/self.matchDict.clear() and ignore the second
question. When I read the sent message, it came to my mind. :-)

Thomas

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Question: Best Practice? (module 'shelve')

[Thomas Ploch]

Hello fellows,

I just wanted to know, if there is any best practice concerning
following code:

import re, shelve

class TextMatcher:
def __init__(self, patterns, email=False, dbName='textmatch.db'):
self._initPatterns(patterns)
self.email = email
self.dbName = dbName
if self.email:
self.emailList = []
self.emailList.append(
re.compile(r'[EMAIL PROTECTED]'))

def match(self, src, url):
self.matchDict = {}
self.matchDict[url] = {}
# The next 2 functions just add stuff to self.matchDict
if self.email:
self._addEmails(src, url)
self._addPatterns(src, url)
# Is it good practice to open, write and close the db straight
# away? Or is it better to leave it open until the whole program
# has finished, and close it then?
self.openDB(self.dbName)
self.db[url] = self.matchDict[url]
self.db.close()
# I want to del the matchDict each time so it can't grow big.
# Is this good, or should it be left open, too?
del self.matchDict

def openDB(self, dbName=None, modeflag='c'):
if dbName == None:
self.db = shelve.open('textmatch.db', flag=modeflag)
else:
self.db = shelve.open(dbName, flag=modeflag)

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Re: How to write temporary data to file?

[Thomas Ploch]

Thomas Ploch schrieb:
> Laszlo Nagy schrieb:
>> Thomas Ploch írta:
>>> Hi folks,
>>>
>>> I have a data structure that looks like this:
>>>
>>> d = {
>>> 'url1': {
>>> 'emails': ['a', 'b', 'c',...],
>>> 'matches': ['d', 'e', 'f',...]
>>> },
>>> 'url2': {...
>>> }
>>>
>>> This dictionary will get _very_ big, so I want to write it somehow to a
>>> file after it has grown to a certain size.
>>>
>>> How would I achieve that?
>>>   
>> How about dbm/gdbm? Since urls are strings, you can store this dict in a
>> database instance and actually use it from your program as it were a dict?
>>
>>   Laszlo
>>
> 
> Well, but how do I save the nested dict values? I don't want to eval
> them, so this is no option for me.
> 
> Thomas

I just saw shelve is the module to go for.

Thomas
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Re: How to write temporary data to file?

[Thomas Ploch]

Laszlo Nagy schrieb:
> Thomas Ploch írta:
>> Hi folks,
>>
>> I have a data structure that looks like this:
>>
>> d = {
>> 'url1': {
>> 'emails': ['a', 'b', 'c',...],
>> 'matches': ['d', 'e', 'f',...]
>> },
>> 'url2': {...
>> }
>>
>> This dictionary will get _very_ big, so I want to write it somehow to a
>> file after it has grown to a certain size.
>>
>> How would I achieve that?
>>   
> How about dbm/gdbm? Since urls are strings, you can store this dict in a
> database instance and actually use it from your program as it were a dict?
> 
>   Laszlo
> 

Well, but how do I save the nested dict values? I don't want to eval
them, so this is no option for me.

Thomas
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Re: How to write temporary data to file?

[Thomas Ploch]

Ravi Teja schrieb:
> Thomas Ploch wrote:
>> Ravi Teja schrieb:
>>> Thomas Ploch wrote:
>>>> Hi folks,
>>>>
>>>> I have a data structure that looks like this:
>>>>
>>>> d = {
>>>>'url1': {
>>>>'emails': ['a', 'b', 'c',...],
>>>>'matches': ['d', 'e', 'f',...]
>>>>},
>>>>'url2': {...
>>>> }
>>>>
>>>> This dictionary will get _very_ big, so I want to write it somehow to a
>>>> file after it has grown to a certain size.
>>>>
>>>> How would I achieve that?
>>>>
>>>> Thanks,
>>>> Thomas
>>> Pickle/cPickle are standard library modules that can persist data.
>>> But in this case, I would recommend ZODB/Durus.
>>>
>>> (Your code example scares me. I hope you have benevolent purposes for
>>> that application.)
>>>
>>> Ravi Teja.
>>>
>> Thanks, but why is this code example scaring you?
>>
>> Thomas
> 
> The code indicates that you are trying to harvest a _very_ (as you put
> it) large set of email addresses from web pages. With my limited
> imagination, I can think of only one group of people who would need to
> do that. But considering that you write good English, you must not be
> one of those mean people that needed me to get a new email account just
> for posting to Usenet :-).
> 
> Ravi Teja.
> 

Oh, well, yes you are right that this application is able to harvest
email addresses. But it can do much more than that. It has a text
matching engine, that according to given meta keywords can scan or not
scan documents in the web and harvest all kinds of information. It can
also be fed with callbacks for each of the Content-Types. I know that
the email matching engine is a kind of a 'grey zone', and I asked
myself, if it needs the email stuff. But I mean you could easily include
the email regex to the text matching engine yourself, so I decided to
add this functionality (it is 'OFF' by default :-) ).

Thomas

P.S.: No, I am a good person.

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Re: How to write temporary data to file?

[Thomas Ploch]

Ravi Teja schrieb:
> Thomas Ploch wrote:
>> Hi folks,
>>
>> I have a data structure that looks like this:
>>
>> d = {
>>  'url1': {
>>  'emails': ['a', 'b', 'c',...],
>>  'matches': ['d', 'e', 'f',...]
>>  },
>>  'url2': {...
>> }
>>
>> This dictionary will get _very_ big, so I want to write it somehow to a
>> file after it has grown to a certain size.
>>
>> How would I achieve that?
>>
>> Thanks,
>> Thomas
> 
> Pickle/cPickle are standard library modules that can persist data.
> But in this case, I would recommend ZODB/Durus.
> 
> (Your code example scares me. I hope you have benevolent purposes for
> that application.)
> 
> Ravi Teja.
> 

Thanks, but why is this code example scaring you?

Thomas
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Re: private variables

[Thomas Ploch]

belinda thom schrieb:
> Hello,
> 
> In what version of python were private variables added?
> 
> Thanks,
> 
> --b
> 

With this question you stepped into a bee hive. :-)

Read the 'Why less emphasis on private data?' thread.

But I can't tell you, when this so called 'private variables' were added.

Thomas
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How to write temporary data to file?

[Thomas Ploch]

Hi folks,

I have a data structure that looks like this:

d = {
'url1': {
'emails': ['a', 'b', 'c',...],
'matches': ['d', 'e', 'f',...]
},
'url2': {...
}

This dictionary will get _very_ big, so I want to write it somehow to a
file after it has grown to a certain size.

How would I achieve that?

Thanks,
Thomas
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Re: how to find the longst element list of lists

[Thomas Ploch]

Michael M. schrieb:
>> Err... this makes three distinct lists, not a list of lists.
>>
> 
> Sure. Logically spoken. Not in Python code. Or a number of lists.
> Sure not [[ bla... ] [bla.]] etc.

???

Thomas
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Re: how to find the longst element list of lists

[Thomas Ploch]

Michael M. schrieb:
> How to find the longst element list of lists?
> 
> I think, there should be an easier way then this:
> 
>s1 = ["q", "e", "d"]
>s2 = ["a", "b"]
>s3 = ["a", "b", "c", "d"]
> 
>if len(s1) >= len(s2) and len(s1) >= len(s3):
>  sx1=s1  ## s1 ist längster
>  if len(s2) >= len(s3):
>sx2=s2
>sx3=s3
>  else:
>sx2=s3
>sx3=s2
> 
>if len(s2) >= len(s3) and len(s2) >= len(s1):
>  sx1=s2  ## s2 ist längster
>  if len(s3) >= len(s1):
>sx2=s3
>sx3=s1
>  else:
>sx2=s1
>sx3=s3
> 
>if len(s3) >= len(s1) and len(s3) >= len(s2):
>  sx1=s3  ## s3 ist längster
>  if len(s1) >= len(s2):
>sx2=s1
>sx3=s2
>  else:
>sx2=s2
>sx3=s1
> 
> After, the list ist sorted:
> 
>sx1 = ["a", "b", "c", "d"]
>sx2 = ["q", "e", "d"]
>sx3 = ["a", "b"]
> 

I don't really get that. You have three lists, you want to sort them
after their length. You should put them into one list.
I think you should rather implement this as:

 >>> list = [a1, s2, s3]
 >>> list.sort(lambda x,y: cmp(len(y), len(x)))
 >>> list
 [['a', 'b', 'c', 'd'], ['q', 'e', 'd'], ['a', 'b']]

Thomas
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Re: Python re expr from Perl to Python

[Thomas Ploch]

Florian Diesch schrieb:
> "Michael M." <[EMAIL PROTECTED]> wrote:
> 
>> In Perl, it was:
>>
>>
>>   ## Example: "Abc | def | ghi | jkl"
>>   ##   -> "Abc ghi jkl"
>>   ## Take only the text betewwn the 2nd pipe (=cut the text in the 1st
>> pipe).
>>   $na =~ s/\ \|(.*?)\ \|(.*?)\ \|/$2/g;
>>
>>   ## -- remove [ and ] in text
>>   $na =~ s/\[//g;
>>   $na =~ s/\]//g;
>>   # print "DEB: \"$na\"\n";
>>
>>
>> # input string
>> na="Abc | def | ghi | jkl [gugu]"
>> # output
>> na="Abc ghi jkl gugu"
>>
>>
>> How is it done in Python?
> 
 import re
 na="Abc | def | ghi | jkl [gugu]"
 m=re.match(r'(\w+ )\| (\w+ )\| (\w+ )\| (\w+ )\[(\w+)\]', na)
 na=m.expand(r'\1\2\3\5')
 na
> 'Abc def ghi gugu'

I'd rather have the groups grouped without the whitespaces

 >>> import re
 >>> na="Abc | def | ghi | jkl [gugu]"
 >>> m=re.match(r'(\w+) \| (\w+) \| (\w+) \| (\w+) \[(\w+)\]', na)
 >>> na=m.expand(r'\1 \3 \4 \5')
 >>> na
 'Abc ghi jkl gugu'

Thomas

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Re: Why less emphasis on private data?

[Thomas Ploch]

Sebastian 'lunar' Wiesner schrieb:
> 
> Those people deserve to fail for being just extraordinary stupid...
> 

Yes, but there are a lot of them around...

Thomas


P.S.: I don't mean they are around here. :-)
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Re: Why less emphasis on private data?

[Thomas Ploch]

sturlamolden schrieb:
> [EMAIL PROTECTED] wrote:
>> Coming from a C++ / C# background, the lack of emphasis on private data
>> seems weird to me. I've often found wrapping private data useful to
>> prevent bugs and enforce error checking..
>>
>> It appears to me (perhaps wrongly) that Python prefers to leave class
>> data public.  What is the logic behind that choice?
> 
> The designers of Java, C++, C#, Ada95, Delphi, etc. seem to think that
> if an object's 'internal' variables or states cannot be kept private,
> programmers get an irresistible temptation to mess with them in
> malicious ways. But if you are that stupid, should you be programming
> in any language? The most widely used language is still C, and there is
> no concept of private data in C either, nor is it needed.

There is a kind of this concept in C with 'static' declarations.

> As mentioned in other replies, it is not rocket science to access a
> class private data. In C++ you can cast to void*, in Java and C# you
> can use reflection. C++ is said to be an "unsafe" language because
> programmers can, using a few tricks, mess with the vtables. But how
> many really do that?

Exactly, if they were available, a lot more would do that. I think this
is the point. Programmers who can do that normally are sensible towards
that people who have designed this or that knew what they were doing.
But there are enough people that don't have a clue and _will_ fiddle
around and then flame all kind of mailing lists with requests for help
cause they did it wrong.




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Re: Just Getting Started with Python on MS XP Pro

[Thomas Ploch]

W. Watson schrieb:
> As I understand it, there are two files I'm after: 1. python interpreter, 
> and 2. a python editor. It's #2 that I'm having trouble downloading. The 
> link is broken.

This is the python interpreter for windows:

http://www.python.org/ftp/python/2.5/python-2.5.msi


Here you can check for editors:

http://wiki.python.org/moin/PythonEditors


Here you will get the pywin32 package (also including the Win32 API, COM
support, and Pythonwin):

http://sourceforge.net/projects/pywin32/

I am not sure if you actually read any of our posts, because there is no
404 whatsoever. On none of the posted links in the whole thread.

Thomas
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Re: Why less emphasis on private data?

[Thomas Ploch]

Paul Rubin schrieb:
> Thomas Ploch <[EMAIL PROTECTED]> writes:
>> Me neither, although I have to say that the '__' prefix comes pretty
>> close to being 'private' already. It depends on the definition of
>> private. For me, private means 'not accessible from outside the
>> module/class'.

> 
> class A:
>   __x = 3
> 
> class B(A):
>   __x = 4   # ok
> 
> class C(B):
>   __x = 5   # oops!
> 
> Consider that the above three class definitions might be in separate
> files and you see how clumsy this gets.  


I don't understand why this should be oops, even if they are in
different files.

 >>> a = A()
 >>> print a._A__x
 3
 >>> b = B()
 >>> print b._B__x
 4
 >>> c = C()
 >>> print c._C__x
 5
 >>> dir(c)
 ['_A__x', '_B__x', '_C__x', '__doc__', '__module__']
 >>> print c._A__x
 3
 >>> print c._B__x
 4
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Re: Why less emphasis on private data?

[Thomas Ploch]

Jorgen Grahn schrieb:
> On 06 Jan 2007 17:38:06 -0800, Paul Rubin  wrote:
>> "BJörn Lindqvist" <[EMAIL PROTECTED]> writes:
>>> It is given that emphasizing private data (encapsulation) leads to
>>> more internal complexity and more lines of code because you have to
>>> write getters and setters and stuff.
>> You can have public variables in Java if you choose to.  Writing
>> private variables with public setters and getters is just a style choice.
> 
> Privates with getters/setters are (as I think someone else hinted) pretty
> pointless. The interesting stuff is the private data that *is* private, i.e.
> not meant for users at all.

Not really pointless, since you can hide your data structures that you
don't want to be fiddled around with (which for me is almost the only
point to use it).

> But yes, I don't mind not having 'private:' in Python. I don't have
> compile-time type checking anyway. In fact, I don't always know what the
> attributes of my objects /are/ until runtime.

Me neither, although I have to say that the '__' prefix comes pretty
close to being 'private' already. It depends on the definition of
private. For me, private means 'not accessible from outside the
module/class'.

Thomas

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Re: I want to learn

[Thomas Ploch]

[EMAIL PROTECTED] schrieb:
> Hi,
> 
> I have been "programming" in the .net environment and ide for a few
> years and I am looking to make the switch over to python. I have
> absolutely no python experience whatsoever. I am looking for a python
> guru who has instant messenger or gtalk or whatever who can meet me
> online in the mornings, give me some direction for the day and then
> answer some questions here and there online throughout the day. 


So you are looking for a person (no, a guru), that stays by your side
the whole day, gives you answers and helps you learning python.

This is a ridiculous request.

If you want to learn python, you should start with visiting
http://www.diveintopython.org/ and read it. If you have previous
programming experience, this is the place to start.

> Sorry to interrupt the group but since all python gurus appear to be
> happily at work on the next level apps at google nobody responded to
> my craigslist ads.

You can always ask your questions here on the list, there are enough
people that are willing to help.

Thomas
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Re: Why less emphasis on private data?

[Thomas Ploch]

[EMAIL PROTECTED] schrieb:
> Coming from a C++ / C# background, the lack of emphasis on private data
> seems weird to me. I've often found wrapping private data useful to
> prevent bugs and enforce error checking..
> It appears to me (perhaps wrongly) that Python prefers to leave class
> data public.  What is the logic behind that choice?
> 
> Thanks any insight.
> 

Python doesn't prefer public data in classes. It leaves the choice to
the programmer. You can define your own private instance variables (or
functions) by using a '__' prefix:

example:
class Foo:
def __init__(self, data):
self.__data = data

def get_data(self):
return self.__data


 >>> f = Foo('bar')
 >>> f.__data
 Traceback (most recent call last):
   File "", line 1, in 
 AttributeError: Foo instance has no attribute '__data'
 >>> f.get_data()
 'bar'

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Re: Dividing integers...Convert to float first?

[Thomas Ploch]

Beliavsky schrieb:
> If the C or Fortran committees tried to change
> the meaning of int/int, they would be shot.

Or hanged...

> If you want to be confident that your code will run, unchanged, 10
> years from now on the hardware and OS that will then be common, Python
> 2.x is not the language to use, unfortunately. From what I have read,
> Python 3 will break things more fundamental than int/int.
> 

Yes, but until then we have to use python 2.x. And I think that python
2.x will be around quite a while after python 3000 has been released if
it breaks so much.

Thomas
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Re: Just Getting Started with Python on MS XP Pro

[Thomas Ploch]

W. Watson schrieb:
> The wiki site lead to a link to download pythonwin, but the download is 
> broken. Googling invariably leads back to that link. I found 
> , which has 
> two files listed: oadist.exe and win32dbg.exe. Do I need both or is just the 
> latter one?


A google query 'pythonwin' directly brings me here:

https://sourceforge.net/projects/pywin32/

I think this is the place to go

Thomas


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Re: PyGreSQL Install

[Thomas Ploch]

goodepic schrieb:
> I successfully installed postgresql and pygresql from source on my
> MacBook 2ghz Intel core duo running os x 10.4.8.  However, pygresql
> installed under the defualt python 2.3 installation, while I've been
> upgrading and working in 2.5, and have invested too much time to go
> back to 2.3.  I definitely don't know where every file is, but I know
> that the site-packages folder where I need pgdb to be is
> /Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages.
>  This is where I have pypar, pynum, numeric, etc.  PyGreSQL installed
> in the default
> /System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/site-packages.
> 
> 
> Anyone know where I can edit setup.py or what flags I can use to force
> the install onto 2.5?
> 
> Thanks!
> 

You should try:

$ python2.5 setup.py install

Normally it gets installed into the directory of the python version you
use when running setup.py. Is python 2.3 still the default on MAC OS X
10.4? I thought they switched to python 2.4.

Thomas
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Re: Dividing integers...Convert to float first?

[Thomas Ploch]

Grant Edwards schrieb:
> On 2007-01-05, Jonathan Smith <[EMAIL PROTECTED]> wrote:
> 
> from __future__ import division
> 1/2
>> 0.5
> 
>$ python
>Python 2.4.3 (#1, Dec 10 2006, 22:09:09) 
>[GCC 3.4.6 (Gentoo 3.4.6-r1, ssp-3.4.5-1.0, pie-8.7.9)] on linux2
>Type "help", "copyright", "credits" or "license" for more
>information.
>>>> from __future__ import LotteryNumbers
>  File "", line 1
>SyntaxError: future feature LotteryNumbers is not defined
>>>> 
> 
> Damn.  
> 
> I guess it's back to work then.
> 

You are working as an oracle?

:-)

Thomas
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Re: Dividing integers...Convert to float first?

[Thomas Ploch]

Jonathan Smith schrieb:
> Thomas Ploch wrote:
>> [EMAIL PROTECTED] schrieb:
>>> I'm still pretty new to Python. I'm writing a function that accepts
>>> thre integers as arguments. I need to divide the first integer by te
>>> second integer, and get a float as a result. I don't want the caller of
>>> the function to have to pass floats instead of integers. How do I
>>> convert the arguments passed to the function into floats before I do
>>> the division? Is this necessary, or is their a better way?
>>>
>>> Thanks,
>>>
>>> Scott Huey
>>>
>>
>> Yes, it is necessary. If you divide two integers, the result will be an
>> integer.
>>
>>  >>> 1/2
>>  0
>>
>> You need the function float() -> float because a division between
>> integers and floats will have floats as their results
>>
>>  >>> float(1)/2
>>  0.5
> 
> 
>>>> from __future__ import division
>>>> 1/2
> 0.5
> 
> -smithj
> 

aahh, I have been tought so many things about python that are actually
so old, that I am starting to feel embarrassed.

That brings me to the point, that learning a language X at university
always brings you to a point where you know (almost) everything, but in
reality know nothing because course material is too old...

Thomas
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Re: Dividing integers...Convert to float first?

[Thomas Ploch]

[EMAIL PROTECTED] schrieb:
> I'm still pretty new to Python. I'm writing a function that accepts
> thre integers as arguments. I need to divide the first integer by te
> second integer, and get a float as a result. I don't want the caller of
> the function to have to pass floats instead of integers. How do I
> convert the arguments passed to the function into floats before I do
> the division? Is this necessary, or is their a better way?
> 
> Thanks,
> 
> Scott Huey
> 

Yes, it is necessary. If you divide two integers, the result will be an
integer.

 >>> 1/2
 0

You need the function float() -> float because a division between
integers and floats will have floats as their results

 >>> float(1)/2
 0.5
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Re: program deployment

[Thomas Ploch]

Grant Edwards schrieb:
> On 2007-01-05, king kikapu <[EMAIL PROTECTED]> wrote:
> 
>>> Python code is normally deployed as straight source code.
>> But isn't this a problem of its own? I mean, many people do not feel
>> good if the know that their source code is lying around on other
>> machines...
> 
> Are they embarassed by their code?
> 

hehehe, but what I am thinking: Is it somehow possible to _really_ hide
the source from being viewed by other persons when using python? Not
that I want to do that ( I am an Open Source friend ), but that might
get others that rely on that (commercial) to use python for more
projects as it is done now.

Thomas
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Re: What is proper way to require a method to be overridden?

[Thomas Ploch]

Grant Edwards schrieb:
> On 2007-01-05, Thomas Ploch <[EMAIL PROTECTED]> wrote:
> 
>>>> I am writing a class that is intended to be subclassed.  What
>>>> is the proper way to indicate that a sub class must override a
>>>> method?
>>> If any subclass *must* override a method, raise
>>> NotImplementedError in the base class (apart from documenting
>>> how your class is supposed to be used).
>> I learn so much from this list. I didn't even know this error existed.
> 
> And remember: even if it didn't, you could have created your
> own:

Erm, it wasn't me who asked. I just wanted to say that I didn't know
that there is a NotImplementedError. Havn't seen it before.

:-)

Thomas
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Re: What is proper way to require a method to be overridden?

[Thomas Ploch]

Gabriel Genellina schrieb:
> At Thursday 4/1/2007 23:52, jeremito wrote:
> 
>> I am writing a class that is intended to be subclassed.  What is the
>> proper way to indicate that a sub class must override a method?
> 
> If any subclass *must* override a method, raise NotImplementedError in
> the base class (apart from documenting how your class is supposed to be
> used).
> 
> 

I learn so much from this list. I didn't even know this error existed.

Thomas
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Re: What is proper way to require a method to be overridden?

[Thomas Ploch]

jeremito schrieb:
> I am writing a class that is intended to be subclassed.  What is the
> proper way to indicate that a sub class must override a method?
> 
> Thanks,
> Jeremy
> 

What do you mean by 'indicate'? Writing it to the docstring of the
class/method? Writing a comment?

class Foo:
"""
When inheriting from Foo, method foo must be
overridden. Otherwise SPAM.
"""
def foo(self):
print 'bar'

class Bar(Foo):
def __init__(self):
Foo.__init__(self)

# Has to be defined to override the base class's method
# when inheriting from class Foo. Otherwise: SPAM
def foo(self):
print 'foo'

I don't know any other way.

Thomas
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Best way to implement a timed queue?

[Thomas Ploch]

Hello folks,

I am having troubles with implementing a timed queue. I am using the
'Queue' module to manage several queues. But I want a timed access, i.e.
only 2 fetches per second max. I am horribly stuck on even how I
actually could write it. Has somebody done that before? And when yes,
how is the best way to implement it?

Thanks,
Thomas
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Re: static object

[Thomas Ploch]

meelab schrieb:
> Dear All,
> 
> I am looking for a way to create a "static object" or a "static class" -
> terms might be inappropriate - having for instance:
> 
> class StaticClass:
> .
> .
> 
> and then
> staticObject1 = StaticClass()
> staticObject2 = StaticClass()
> 
> so that staticObject1 and staticObject2 refers exactly to the same
> instance of object.
> 
> In other words, that is a class which would result in only 1 instance
> always the same no matter how many times I will "instantiate" it.
> 
> My purpose is to permit this class to initialize a massive amount of
> data that I need to access from different points of my program without
> duplicating this data in memory and without loosing time in reloading it
>  each time I need it.
> 
> I noticed the staticmethods, and the __new__ method which could , but I
> always get stuck in actually creating static DATA without having global
> data.
> 
> Does anyone have a start of a clue to this ?
> 
> Many thanks in advance
> 
> Emmanuel.

class DataStorage:
def __init__(self, data):
self.data = data

dataVault = DataStorage(data)
dataVault1 = dataVault
dataVault2 = dataVault
...


but why not use a static_data.py (put your data in there) file and do:

 >>> from static_data.py import DATA

This way you only load it once and it will be accessible throughout your
program.

Thomas
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Re: C/C++, Perl, etc. to Python converter

[Thomas Ploch]

Matimus schrieb:
> I don't know of a converter, one may exist. I have seen similar
> requests though and will give you a similar response to what I have
> seen. A converter, if it exists, may be able to produce working code
> but _not_ readable code. Python is a language whose strength comes
> from, among other things, its readability and conventions. Learning
> python is best done by using the online documentation
> (http://docs.python.org/tut/tut.html) and reading existing code (take a
> look at the built in modules).
> 
> My biggest fear of teaching someone to program by using a program to
> convert perl to python is that they will end up writing python that
> still looks like perl.
> 
> I don't know if it helps, but I know others will give you similar
> advice.
> 
> -Matt
> 

I think that it *is* possible to do it, but a whole lot of work had to
be done to achieve this. It is all about how many rules (like how to
convert this block of unreadable code of language X into a readable
python block) you are willing to find/program (and these are a lot). It
is a almost gigantic task to make this work proper, but it definitely
*is* possible.

Something like this doesn't exist yet, but people (especially
Computational Linguists) are working on this.

Thomas
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Re: Question concerning this list [WebCrawler]

[Thomas Ploch]

John Nagle schrieb:
> 
> Very true.  HTML is LALR(0), that is, you can parse it without
> looking ahead.  Parsers for LALR(0) languages are easy, and
> work by repeatedly getting the next character and using that to
> drive a single state machine.  The first character-level parser
> yields tokens, which are then processed by a grammar-level parser.
> Any compiler book will cover this.
> 
> Using regular expressions for LALR(0) parsing is a vice inherited
>>from Perl, in which regular expressions are easy and "get next
> character from string" is unreasonably expensive.  In Python, at least
> you can index through a string.
> 
>   John Nagle

I take it with LALR(0) you mean that HTML is a language created by a
Chomsky-0 (regular language) Grammar?

Thomas
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Re: WebCrawler (was: 'Question concerning this list')

[Thomas Ploch]

Marc 'BlackJack' Rintsch schrieb:
> In <[EMAIL PROTECTED]>, Thomas Ploch
> wrote:
> 
>> This is how my regexes look like:
>>
>> import re
>>
>> class Tags:
>> def __init__(self, sourceText):
>> self.source = sourceText
>> self.curPos = 0
>> self.namePattern = "[A-Za-z_][A-Za-z0-9_.:-]*"
>> self.tagPattern = re.compile("<(?P%s)(?P[^>]*)>"
>> % self.namePattern)
>> self.attrPattern = re.compile(
>> r"\s+(?P%s)\s*=\s*(?P\"[^\"]*\"|'[^']*')"
>> % self.namePattern)
> 
> Have you tested this with tags inside comments?

No, but I already see your point that it will parse _all_ tags, even if
they are commented out. I am thinking about how to solve this. Probably
I just take the chunks between comments and feed it to the regular
expressions.

>>>> You are probably right. For me it boils down to these problems:
>>>> - Implementing a stack for large queues of documents which is faster
>>>> than list.pop(index) (Is there a lib for this?)
>>> If you need a queue then use one:  take a look at `collections.deque` or
>>> the `Queue` module in the standard library.
>> Which of the two would you recommend for handling large queues with fast
>> response times?
> 
> `Queue.Queue` builds on `collections.deque` and is thread safe.  Speedwise
> I don't think this makes a difference as the most time is spend with IO
> and parsing.  So if you make your spider multi-threaded to gain some speed
> go with `Queue.Queue`.

I think I will go for collections.deque (since I have no intention of
making it multi-threaded) and have several queues, one for each server
in a list to actually finish one server before being directed to the
next one straight away (Is this a good approach?).

Thanks a lot,
Thomas


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Re: Question concerning this list [WebCrawler]

[Thomas Ploch]

Marc 'BlackJack' Rintsch schrieb:
> In <[EMAIL PROTECTED]>, Thomas Ploch
> wrote:
> 
>> Alright, my prof said '... to process documents written in structural
>> markup languages using regular expressions is a no-no.' (Because of
>> nested Elements? Can't remember) So I think he wants us to use regexes
>> to learn them. He is pointing to HTMLParser though.
> 
> Problem is that much of the HTML in the wild is written in a structured
> markup language but it's in many cases broken.  If you just search some
> words or patterns that appear somewhere in the documents then regular
> expressions are good enough.  If you want to actually *parse* HTML "from
> the wild" better use the BeautifulSoup_ parser.
> 
> .. _BeautifulSoup: http://www.crummy.com/software/BeautifulSoup/

Yes, I know about BeautifulSoup. But as I said it should be done with
regexes. I want to extract tags, and their attributes as a dictionary of
name/value pairs. I know that most of HTML out there is *not* validated
and bollocks.

This is how my regexes look like:

import re

class Tags:
def __init__(self, sourceText):
self.source = sourceText
self.curPos = 0
self.namePattern = "[A-Za-z_][A-Za-z0-9_.:-]*"
self.tagPattern = re.compile("<(?P%s)(?P[^>]*)>"
% self.namePattern)
self.attrPattern = re.compile(
r"\s+(?P%s)\s*=\s*(?P\"[^\"]*\"|'[^']*')"
% self.namePattern)

>> You are probably right. For me it boils down to these problems:
>> - Implementing a stack for large queues of documents which is faster
>> than list.pop(index) (Is there a lib for this?)
> 
> If you need a queue then use one:  take a look at `collections.deque` or
> the `Queue` module in the standard library.

Which of the two would you recommend for handling large queues with fast
response times?

Thomas
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Re: Question concerning this list

[Thomas Ploch]

Steven D'Aprano wrote:
> On Sun, 31 Dec 2006 02:03:34 +0100, Thomas Ploch wrote:
> 
>> Hello fellow pythonists,
>>
>> I have a question concerning posting code on this list.
>>
>> I want to post source code of a module, which is a homework for
>> university (yes yes, I know, please read on...).
> 
> So long as you understand your university's policy on collaborations.

Well, collaborations are wanted by my prof, but I think he actually
meant it in a way of getting students bonding with each other and
establishing social contacts. He just said that he will reject copy &
paste stuff and works that actually have nothing to do with the topic
(when we were laughing, he said we couldn't imagine what sometimes is
handed in).

>> It is a web crawler (which I will *never* let out into the wide world)
> 
> If you post it on Usenet, you will have let it out into the wide world.
> People will see it. Some of those people will download it. Some of them
> will run it. And some of them will run it, uncontrolled, on the WWW.
> 
> Out of curiosity, if your web crawler isn't going to be used on the web,
> what were you intending to use it on?

It's a final homework, as I mentioned above, and it shouldn't be used
anywhere but our university server to test it (unless timing of requests
(i.e. only two fetches per second), handling of 'robots.txt' is
implemented). But you are right with the Usenet thing, havn't thought
about this actually, so I won't post the whole portion of the code.

>> which uses regular expressions (and yes, I know, thats not good, too).
> 
> Regexes are just a tool. Sometimes they are the right tool for the job.
> Sometimes they aren't.

Alright, my prof said '... to process documents written in structural
markup languages using regular expressions is a no-no.' (Because of
nested Elements? Can't remember) So I think he wants us to use regexes
to learn them. He is pointing to HTMLParser though.

>> I have finished it (as far as I can), but since I need a good mark to
>> actually finish the course, I am wondering if I can post the code, and I
>> am wondering if anyone of you can review it and give me possible hints
>> on how to improve things.


> It probably isn't a good idea to post a great big chunk of code and expect
> people to read it all. If you have more specific questions than "how can
> I make this better?", that would be good. Unless the code is fairly
> short, it might be better to just post a few extracted functions and see
> what people say about them, and then you can extend that to the rest of
> your code.

You are probably right. For me it boils down to these problems:
- Implementing a stack for large queues of documents which is faster
than list.pop(index) (Is there a lib for this?)
- Getting Handlers for different MIME/ContentTypes and specify callbacks
only for specific Content-Types / MIME-Types (a lot of work and complex
checks)
- Handle different encodings right.

I will follow your suggestions and post my code concerning specifically
these problems, and not the whole chunk.

Thanks,
Thomas


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Question concerning this list

[Thomas Ploch]

Hello fellow pythonists,

I have a question concerning posting code on this list.

I want to post source code of a module, which is a homework for
university (yes yes, I know, please read on...).

It is a web crawler (which I will *never* let out into the wide world)
which uses regular expressions (and yes, I know, thats not good, too). I
have finished it (as far as I can), but since I need a good mark to
actually finish the course, I am wondering if I can post the code, and I
am wondering if anyone of you can review it and give me possible hints
on how to improve things.

So is this O.K.? Or is this a blatantly idiotic idea?

I hope I am not the idiot of the month right now...

Thanks in advance,
Thomas

P.S.:

I might give some of my Christmas chocolate away as a donation to this
list... :-)
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Merry Christmas and a happy new year!

[Thomas Ploch]

I wish everybody a merry Christmas and a happy new year.

Have a good and beautiful new year.

Thomas
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Re: Fall of Roman Empire

[Thomas Ploch]

Delaney, Timothy (Tim) wrote:
> Hendrik van Rooyen wrote:
> 
>> naaah - you don't have to worry - for real control He uses assembler.
>> with jump statements.
>> so the loops are closed.
>>
>> Unfortunately its not open source.  Yet.
> 
> People are working hard on reverse-engineering it though. I hope no one
> slaps them with a DMCA-style lawsuit ...
> 
> Tim Delaney

I heard Steve Ballmer recently made an offer to the pope for purchasing
the license for an apple and an egg (Apfel und Ei).

Thomas
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Re: Generating all permutations from a regexp

[Thomas Ploch]

Fredrik Lundh wrote:
> Nick Craig-Wood wrote:
> 
>> A regular expression matcher uses a state machine to match strings.
> 
> unless it's the kind of regular expression matcher that doesn't use a 
> state machine, like the one in Python.
> 
> 
> 

How is the matching engine implemented then?

I thought regular languages can be described by deterministic /
non-deterministic finite state machines. I am just curious ...

Thomas
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Re: Does any one know of any good folder/directory modules

[Thomas Ploch]

[EMAIL PROTECTED] schrieb:
> Hi
> 
> Does any one know of any good folder/directory modules. I need to be
> able to see what files and directories are in a folder, I also need to
> be able to see the size of the directory content.
> 
> Thanks
> 

You should have a look here:

http://docs.python.org/lib/os-file-dir.html#os-file-dir

Thomas


(This could have been done by yourself, but I am in a christmasly mood)
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Re: perl better than python for users with disabilities?

[Thomas Ploch]

Martin P. Hellwig schrieb:
> Quite punny title though I assume you are really serious and mean people 
> with a physical disability, I won't comment any further on this subject 
> :-), if I already offended anyone, please excuse me, since I'm original 
> from Germany I'm not supposed to be funny.

Argh, I am writing to President Horst Köhler to take away your German
citizenship. You _need_ to stay true to German attributes (like not
being funny, what you have been...)! This is the last warning!

:-D

Regarding the topic:

I can't see where Perl should be more accessible than Python.

Thomas

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Re: Fall of Roman Empire

[Thomas Ploch]

Felix Benner schrieb:
> Thomas Ploch schrieb:
>>> Ben Finney schrieb:
>>>> "John Machin" <[EMAIL PROTECTED]> writes:
>>>>
>>>>> Ben Finney wrote:
>>>>>
>>>>>>  \  "...one of the main causes of the fall of the Roman Empire was |
>>>>>>   `\that, lacking zero, they had no way to indicate successful |
>>>>>> _o__)   termination of their C programs."  -- Robert Firth |
>>>>> An amusing .sig, but it doesn't address the root cause: As they had no
>>>>> way of testing for the end of a string, in many cases successful
>>>>> termination of their C programs would have been unlikely.
>>>> Yet historically proven: the 'imperium' process they were running
>>>> terminated many centuries ago.
>>>>
>>>> Or did it fork and exec a different process?
>>>>
>> I rather stay with the metaphysics:
>>
>>
>> #include "metaphysics.h"
>>
>> static metaPower God;
>>
>> universe *makeUniverse(metaPower God)
>> {
>> if (!God) {
>> printf("Oops, no God available at the moment.Try again later!");
>> return NULL;
>> }
>>
>> universe *everything;
>>
>> if (!(everything = malloc(sizeof(universe {
>> God.mood = REALLY_BORED;
>> printf("God has no time to create a universe.");
>> return NULL;
>> } else {
>> return universe;
>> }
>> }
>>
>>
>>  :-)
>>
>> Sorry, somehow had to do this. Please slap me (i like it, don't worry)
>> if it's totally stupid
>>
>>
> 
> s totally stupid! You forgot the main function! (not to mention you
> returned universe instead of everything)

Argh, I need some serious slapping (but I changed everything and
universe, and just forgot to change it all the way through (...good that
I am _not_ God)

> static int main(int argc, char **argv) {
>   char *god_name;
>   if (argc)
>   god_name = argv[1];
>   else
>   god_name = "YHWH";
>   metaPower God = getGodByName(god_name);
>   universe *everything = makeUniverse(God);
>   while (simulatePhysics(everything));
>   return 0;
> }

You forgot to check if God wasn't too bored. ;-)

Thomas
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Re: Fall of Roman Empire

[Thomas Ploch]

> Ben Finney schrieb:
>> "John Machin" <[EMAIL PROTECTED]> writes:
>>
>>> Ben Finney wrote:
>>>
  \  "...one of the main causes of the fall of the Roman Empire was |
   `\that, lacking zero, they had no way to indicate successful |
 _o__)   termination of their C programs."  -- Robert Firth |
>>> An amusing .sig, but it doesn't address the root cause: As they had no
>>> way of testing for the end of a string, in many cases successful
>>> termination of their C programs would have been unlikely.
>> Yet historically proven: the 'imperium' process they were running
>> terminated many centuries ago.
>>
>> Or did it fork and exec a different process?
>>

I rather stay with the metaphysics:


#include "metaphysics.h"

static metaPower God;

universe *makeUniverse(metaPower God)
{
if (!God) {
printf("Oops, no God available at the moment.Try again later!");
return NULL;
}

universe *everything;

if (!(everything = malloc(sizeof(universe {
God.mood = REALLY_BORED;
printf("God has no time to create a universe.");
return NULL;
} else {
return universe;
}
}


 :-)

Sorry, somehow had to do this. Please slap me (i like it, don't worry)
if it's totally stupid


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Re: regexp

[Thomas Ploch]

Mark Schoonover schrieb:
> 
> You have to pay for this one, but I do like Komodo just for the regex
> feature. I'm rather new to Python, coming over from 10 years of Perl, and
> it's nice to have Komodo stay consistant. Can't wait for 4.0, so I can get
> back to having VI key commands Back into "Learning Python", and DIP...

Yes, I love that, too. The Komodo Rx Toolkit is really good for people
who are new to regular expressions just to try them out, to get to know
grouping, to see how MULTILINE and other flags work.
I can recommend this to anyone who is new to regexes.

Thomas

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Re: Fall of Roman Empire

[Thomas Ploch]

Ben Finney schrieb:
> "John Machin" <[EMAIL PROTECTED]> writes:
> 
>> Ben Finney wrote:
>>
>>>  \  "...one of the main causes of the fall of the Roman Empire was |
>>>   `\that, lacking zero, they had no way to indicate successful |
>>> _o__)   termination of their C programs."  -- Robert Firth |
>> An amusing .sig, but it doesn't address the root cause: As they had no
>> way of testing for the end of a string, in many cases successful
>> termination of their C programs would have been unlikely.
> 
> Yet historically proven: the 'imperium' process they were running
> terminated many centuries ago.
> 
> Or did it fork and exec a different process?
> 

And what about the C-Programs running in the middle of the sun or earth
making them spinning around or having nuclear reactions controlled. I
hope they won't terminate in the near future with exit status != 0
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Re: regular expression

[Thomas Ploch]

Asper Faner schrieb:
> I seem to always have hard time understaing how this regular expression
> works, especially how on earth do people bring it up as part of
> computer programming language. Natural language processing seems not
> enough to explain by the way. Why no eliminate it ?
> 

Erm, I am a student of Computational Linguistics and _NO_ , they should
_NOT_ be eliminated since they are an important part of language
processing in python.

Read this:
http://www.amk.ca/python/howto/regex/


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Re: A Call to Arms for Python Advocacy

[Thomas Ploch]

Thomas Ploch schrieb:
> Roy Smith schrieb:
>> In article <[EMAIL PROTECTED]>,
>>  Jeff Rush <[EMAIL PROTECTED]> wrote:
>>
>>> As the Python Advocacy Coordinator, I've put up some wiki pages on the 
>>> Python 
>>> website for which I'm soliciting ideas, writing and graphics.  Some of the 
>>> material exists scattered about and just needs locating and organizing.
>>>
>>>http://wiki.python.org/moin/Advocacy
>>
>> I think it also appears to need faster hardware.  It's running glacially 
>> slow.
> 
> I hope you are _not_ using IE...
> 
> 
> 
> (Sorry, I didn't want to offend you, but it's fine with me ,too.)
> 
> :-)
> 
> Thomas

Well, I should have not answered right the first of 107 messages without
reading further...

Thomas
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Re: A Call to Arms for Python Advocacy

[Thomas Ploch]

Roy Smith schrieb:
> In article <[EMAIL PROTECTED]>,
>  Jeff Rush <[EMAIL PROTECTED]> wrote:
> 
>> As the Python Advocacy Coordinator, I've put up some wiki pages on the 
>> Python 
>> website for which I'm soliciting ideas, writing and graphics.  Some of the 
>> material exists scattered about and just needs locating and organizing.
>>
>>http://wiki.python.org/moin/Advocacy
> 
> 
> I think it also appears to need faster hardware.  It's running glacially 
> slow.

I hope you are _not_ using IE...



(Sorry, I didn't want to offend you, but it's fine with me ,too.)

:-)

Thomas
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Re: About the 79 character line recommendation

[Thomas Ploch]

Hello,

for me the 80 (or 79) char border when writing code is a fundamental
rule. Being at University and having to document each project on paper,
it is a must do. i.e. I get code from fellow scolars, that have 160
chars per line, and to get that on paper is disgusting, especially in
C/C++. So please, stay true to that.

And don't forget those, who actually view source code in a terminal.

:-)


Thomas
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Re: Why not just show the out-of-range index?

[Thomas Ploch]

stdazi wrote:
> Usually, when I make some coding mistake (index out of range - in this
> case) I just care to fix the mistake and I usually don't mind to
> inspect by how much the index was overflowed. It really seems like a
> feature that should be embedded in some Python debugger than a feature
> in the interpreter itself.
> 

I read the whole thread and this is more or less the first post which
actually has a good thing to say without saying any bad thing about anyone.

Thomas
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[no subject]

[Thomas Ploch]

Amir Michail schrieb:
> krishnakant Mane wrote:
>> just used the py dev plugin for eclipse.
>> it is great.
> 
> But isn't support for java better because the eclipse ide can take
> advantage of explicit type declarations (e.g.,  for intellisense,
> refactoring, etc.)?
> 
> Amir

Obviously, since eclipse _is_ a full blown Java application, so support
for Java is excellent. It was actually developed for being a Java IDE
but (as far as I know) people were liking it so much, so they decided to
make it expandable (and PyDev is actually a good thing, it supports
PyLint and PyChecker, manages the python path when new modules are
added, but can be improved (as can everything :-) )). But as I said, often my 
system hangs when having quite a few
files opened, so that brought me off using it too often.

Thomas


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Re: python vs java & eclipse

[Thomas Ploch]

Thomas Ploch schrieb:
> Amir Michail schrieb:
>> Hi,
>>
>> It seems to me that measuring productivity in a programming language
>> must take into account available tools and libraries.
>>
>> Eclipse for example provides such an amazing IDE for java that it is no
>> longer obvious to me that one would be much more productive in python
>> for medium sized projects.
>>
>> Sure, all that Java static typing can be painful, but Eclipse takes
>> some of that pain away. Moreover, static typing can result in better
>> on-the-fly error detection and refactoring support.
>>
>> Any thoughts on this?
>>
>> Amir
>>
> 
> Yes, thats true, but since eclipse is resource monster (it is still
> using java), and some people (like me) don't have a super fresh and new
> computer, and have to run other services to test their work locally
> (like mysql and apache servers), it gets pretty harsh with eclipse. I
> personally tried eclipse on my laptop (which I work most with), and I
> had quite a system resource problem. So I switched back to vim and
> console and it hasn't been too bad, since if you know how to use a
> powerful editor, it can be as productive.
> 
> But in the end, it is up to anyone to find the best solutiion for
> themselves.
> 
> Thomas
> 

Yes, thats true, but since eclipse is resource monster (it is still
using java), and some people (like me) don't have a super fresh and new
computer, and have to run other services to test their work locally
(like mysql and apache servers), it gets pretty harsh with eclipse. I
personally tried eclipse on my laptop (which I work most with), and I
had quite a system resource problem. So I switched back to vim and
console and it hasn't been too bad, since if you know how to use a
powerful editor, it can be as productive.

But in the end, it is up to anyone to find the best solutiion for
themselves.

Thomas

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Open and closing files

[Thomas Ploch]

Is it defined behaviour that all files get implicitly closed when not
assigning them?

Like:

def writeFile(fName, foo):
open(fName, 'w').write(process(foo))

compared to:


def writeFile(fName, foo):
fileobj = open(fName, 'w')
fileobj.write(process(foo))
fileobj.close()

Which one is the 'official' recommended way?

Thomas
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Re: best way to align words?

[Thomas Ploch]

Robert R. schrieb:
> Hello,
> 
> i would like to write a piece of code to help me to align some sequence
> of words and suggest me the ordered common subwords of them
> 
> s0 = "this is an example of a thing i would like to have".split()
> s1 = "another example of something else i would like to have".split()
> s2 = 'and this is another " example " but of something ; now i would
> still like to have'.split()
> ...
> alist = (s0, s1, s2)
> 
> result should be : ('example', 'of', 'i', 'would', 'like', 'to', 'have'
> 
> but i do not know how should i start, may be have you a helpful
> suggestion?
> a trouble i have if when having many different strings my results tend
> to be nothing while i still would like to have one of the, or maybe,
> all the best matches.
> 
> best.
> 

As far as I can see, you want to have the words, that all three lists
have in common, right?

s0 = "this is an example of a thing i would like to have".split()
s1 = "another example of something else i would like to have".split()
s2 = 'and this is another " example " but of something ; now i would
still like to have'.split()

def findCommons(s0, s1, s2):
res = []
for word in s0:
if word in s1 and word in s2:
res.append(word)
return res

 >>>print findCommons(s0,s1,s2)
 ['example', 'of', 'i', 'would', 'like', 'to', 'have']
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Re: Is there an easier way to express this list slicing?

[Thomas Ploch]

John Henry schrieb:
> Thomas Ploch wrote:
> 
>> I had a little bit of fun while writing this:
>>
>> itemList = (a,b,c1,c2,c3,d1,d2,d3,d4,d5) and
>> itemList2 = (a1,a2,a3,b,c,d1,d2,d3,d4,d5) the next time.
>>
> 
> Huh?  What's a,b,....d5?
> 

John Henry schrieb:
> > Thomas Ploch wrote:
> > 
>> >> I had a little bit of fun while writing this:
>> >>
>> >> itemList = (a,b,c1,c2,c3,d1,d2,d3,d4,d5) and
>> >> itemList2 = (a1,a2,a3,b,c,d1,d2,d3,d4,d5) the next time.
>> >>
> >
> > Huh?  What's a,b,d5?
> >

Can be any object, as you had in your example in your mail:

>>>If I have a list of say, 10 elements and I need to slice it into
>>> irregular size list, I would have to create a bunch of temporary
>>> variables and then regroup them afterwords, like:
>>>
>>> # Just for illustration. Alist can be any existing 10 element list
>>> a_list=("",)*10
>>> (a,b,c1,c2,c3,d1,d2,d3,d4,d5)=a_list
>>> alist=(a,)
>>> blist=(b,)
>>> clist=(c1,c2,c3)
>>> dlist=(d2,d3,d4,d5)

>> def getSlices(aCount, bCount, cCount, dCount, items):
>> a,b,c,d = (items[0:aCount],
>> items[aCount:aCount+bCount],
>> items[aCount+bCount:aCount+bCount+cCount],
>>  item[aCount+bCount+cCount:aCount+bCount+cCount+dCount])
> 
> You meant "items" here, right?
> 
>> return list(a),list(b),list(c),list(d)
>>
>>>>> a,b,c,d = getSlices(1,1,3,5,itemList)
>>>>> print a,b,c,d
>> ['a'] ['b'] ['c1', 'c2', 'c3'] ['d1', 'd2', 'd3', 'd4', 'd5']
>>
>>>>> a,b,c,d = getSlices(3,1,1,0,itemList2)
>>>>> print a,b,c,d
>> ['a1', 'a2', 'a3'] ['b'] ['c'] []
>>
>> %-)
>>
>> Thomas
> 

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Re: Is there an easier way to express this list slicing?

[Thomas Ploch]

John Henry schrieb:
> If I have a list of say, 10 elements and I need to slice it into
> irregular size list, I would have to create a bunch of temporary
> variables and then regroup them afterwords, like:
> 
> # Just for illustration. Alist can be any existing 10 element list
> a_list=("",)*10
> (a,b,c1,c2,c3,d1,d2,d3,d4,d5)=a_list
> alist=(a,)
> blist=(b,)
> clist=(c1,c2,c3)
> dlist=(d2,d3,d4,d5)
> 
> That obviously work but do I *really* have to do that?
> 
> BTW: I know you can do:
> alist=a_list[0]
> blist=a_list[1]
> clist=a_list[2:5]
> dlist=a_list[5:]
> 
> but I don't see that it's any better.
> 
> Can I say something to the effect of:
> 
> (a,b,c[0:2],d[0:5])=a_list# Obviously this won't work
> 
> ??
> 
> I am asking this because I have a section of code that contains *lots*
> of things like this.  It makes the code very unreadable.
> 
> Thanks,
> 

I had a little bit of fun while writing this:

itemList = (a,b,c1,c2,c3,d1,d2,d3,d4,d5) and
itemList2 = (a1,a2,a3,b,c,d1,d2,d3,d4,d5) the next time.

def getSlices(aCount, bCount, cCount, dCount, items):
a,b,c,d = (items[0:aCount],
items[aCount:aCount+bCount],
items[aCount+bCount:aCount+bCount+cCount],
item[aCount+bCount+cCount:aCount+bCount+cCount+dCount])
return list(a),list(b),list(c),list(d)

>>>a,b,c,d = getSlices(1,1,3,5,itemList)
>>>print a,b,c,d
['a'] ['b'] ['c1', 'c2', 'c3'] ['d1', 'd2', 'd3', 'd4', 'd5']

>>>a,b,c,d = getSlices(3,1,1,0,itemList2)
>>>print a,b,c,d
['a1', 'a2', 'a3'] ['b'] ['c'] []

%-)

Thomas
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Re: Is there an easier way to express this list slicing?

[Thomas Ploch]

John Henry schrieb:
> If I have a list of say, 10 elements and I need to slice it into
> irregular size list, I would have to create a bunch of temporary
> variables and then regroup them afterwords, like:
> 
> # Just for illustration. Alist can be any existing 10 element list
> a_list=("",)*10
> (a,b,c1,c2,c3,d1,d2,d3,d4,d5)=a_list
> alist=(a,)
> blist=(b,)
> clist=(c1,c2,c3)
> dlist=(d2,d3,d4,d5)
> 
> That obviously work but do I *really* have to do that?
> 
> BTW: I know you can do:
> alist=a_list[0]
> blist=a_list[1]
> clist=a_list[2:5]
> dlist=a_list[5:]
> 
> but I don't see that it's any better.
> 
> Can I say something to the effect of:
> 
> (a,b,c[0:2],d[0:5])=a_list# Obviously this won't work
> 
> ??
> 
> I am asking this because I have a section of code that contains *lots*
> of things like this.  It makes the code very unreadable.
> 
> Thanks,
> 

Nothing in your code actually __is__ a list. they are all tuples...
A list is:
aList = [a,b,c1,c2,c3,d1,d2,d3,d4,d5]

Thomas
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Re: Automatic increment

[Thomas Ploch]

Gheorghe Postelnicu schrieb:
> Hi,
> 
> I have a situation of the following type:
> 
> for line in lineList:
> for item in line.split()
> myArray[counter, itemCounter]
> itemCounter = itemCounter + 1
> counter = counter +1
> 
> Is there a way to get rid of the manual incrementation of the 2 counters?
> 
> Thanks,

for counter in xrange(len(lineList)):
for itemCounter in xrange(len(lineList[counter].split()))
myArray[counter, itemCounter]

Thomas
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Re: failure building python 2.5 on mac os x 10.3.9

[Thomas Ploch]

Markus Rosenstihl schrieb:
> On 2006-11-19 15:50:14 +0100, Thomas Ploch <[EMAIL PROTECTED]> said:
> 
>> Hello,
>>
>> I followed the instructions in the Mac/README file.
>>
>> I ran ./configure --enable-framework
>>
>> But when I try to build from source with gcc 4.0.2, following happens:
>>
>>
>> [snip]
>> libtool: can't locate file for: -lSystemStubs
>> libtool: file: -lSystemStubs is not an object file (not allowed in a
>> library)
>> make: *** [Python.framework/Versions/2.5/Python] Error 1
>>
>> What does that mean?
>>
>> Thanks,
>> Thomas
> 
> I had the same problem (why do you have gcc-4.0.2?).
> 
> -lSystemStubs is in Tiger
> 
> 
> First of all, try to install the 10.4 SDK as it will keep you away of a 
> lot of linking problems and such stuff. (yes, it will install on 10.3.9 
> and since then i had no compile problems, i found this as an answer in 
> a post in the apple discussions)
> 
> Then try to compile it again after you have deleted the python source 
> tree (or "make clean").
> If that is still not working you have to edit the Makefile from Python 
> and remove the -lSystemStubs
> (i think both ways work, but i am not sure)
> 
> Make sure you have either a patched readline 5.1 or better a readline 
> 5.2. Otherwise you will get segmentation faults when you are using 
> ipython.
> 
> 
> If it is still not working,
> Good luck!
> 
> 

Thank you,
has been quite a while since I asked, almost forgot about that one.  :-)

I have been using static python for a while, because I couldn't get
around the problem. But after a while I needed the dynamic linker for
some extensions so I thought about what it could be.

I ran into the Mac OS 10.3.9 Python (the shipped one) Bug, and
remembered not having fixed it with the fixmacpython.py (or whatever
it's called) script. So I tried building python framework again, and
whoohoo, it worked. I dunno if it was that or that I updated libtool,
gettext and all that stuff, but hey, I have to admint, I don't care
anymore.  :-)

But it's nice to know that the Tiger Dev Tools run on Panther as well.

Thomas


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Re: Python Worship

[Thomas Ploch]

Nick schrieb:
> http://www.sciencedaily.com/releases/2006/11/061130081347.htm
> 
> World's Oldest Ritual Discovered -- Worshipped The Python 70,000 Years
> Ago
> 
> Nick
> 

That's really interesting since there is an indio tribe in the amazonas
jungle which also worships python.

That just tells me Python is right. Whatever angle you look at it.

:-D

Thomas
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Re: SPE refuses.

[Thomas Ploch]

SPE - Stani's Python Editor schrieb:
> On 30 nov, 10:50, egbert <[EMAIL PROTECTED]> wrote:
>> On Wed, Nov 29, 2006 at 03:15:45PM -0800, SPE - Stani's Python Editor 
>> wrote:> Do you have python-wxversion installed?
>>
>>> $sudo apt-get install python-wxversionThat helped. But why isn't it 
>>> included in the wxPython download ?
> I was surprised as well. I filed a bug report at debian MOTU that spe
> depends as well on python-wxversion, so that it is automatically
> installed together with spe in the future.
> 
>> Anyway, the first screen looks great. I will explore spe.
>> Thanks.
> You're welcome!
> 
> Stani
> 

ell, when reading these posts about SPE, I wanted to try it as well. I
am running the newest version of wxpython with python2.4. I installed
it, all went fine with the setup.py script.

When I tried to open the program, a window appears for about a second,
displaying a traceback.

So I ran the SPE.py debug tool as you have recommended earlier.

here's the output:

Spe is running in debugging mode with this configuration:
- platform  : darwin
- python: 2.4.4
- wxPython  : 2.7.1.3.
- interface : 
- encoding  : mac-roman

Launching application...
Create: Framework: menu.
Create: Framework: toolbar.
Create: Framework: statusbar.
Traceback (most recent call last):
  File "SPE.py", line 209, in ?
style   = style)
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/sm/wxp/smdi.py",
line 1278, in __init__
wx.App.__init__(self,redirect=not debug)
  File
"//Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/wx-2.7.1-mac-unicode/wx/_core.py",
line 7480, in __init__
self._BootstrapApp()
  File
"//Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/wx-2.7.1-mac-unicode/wx/_core.py",
line 7080, in _BootstrapApp
return _core_.PyApp__BootstrapApp(*args, **kwargs)
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/sm/wxp/smdi.py",
line 1297, in OnInit
style   = self.style,
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/sm/wxp/smdi.py",
line 801, in __init__
Parent.__init__(self,app=app,page=page,**options)
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/sm/wxp/smdi.py",
line 595, in __init__
parentFrame = self,
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/sm/wxp/smdi.py",
line 325, in __init__
self.__statusBar__()
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/sm/wxp/smdi.py",
line 417, in __statusBar__
self.statusBar = self.app.StatusBar(parent=self,id=wx.ID_ANY)
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/Menu.py",
line 727, in __init__
self.throbber   = Throbber(self,'throbber_still.gif')
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/Menu.py",
line 733, in __init__
GIFAnimationCtrl.__init__(self,statusBar,-1,info.imageFile(fileName))
  File
"//Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/wx-2.7.1-mac-unicode/wx/animate.py",
line 242, in __init__
self.LoadFile(filename)
  File
"/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/_spe/Menu.py",
line 746, in LoadFile
if fileName != self._fileName and not self._running:
AttributeError: 'Throbber' object has no attribute '_fileName'


Thanks for any help.
Thomas

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Re: working with files and directories

[Thomas Ploch]

halex2000 schrieb:
> Hi all, I'm new with Python, and I thought to use it to automatically rename 
> some files in a directory, but I don't know where should I search the 
> functions: to get all the files of a directory, to rename the files and so 
> on.
> Thank you. 
> 
> 
Have you actually even tried to find some "documentation"?
Have you placed a google search "python directories rename files"?
Thomas
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Re: synching with os.walk()

[Thomas Ploch]

>> os.walk() is a nice generator for performing actions on all files in a
>> directory and subdirectories. However, how can one use os.walk() for walking
>> through two hierarchies at once? I want to synchronise two directories (just
>> backup for now), but cannot see how I can traverse a second one. I do this
>> now with os.listdir() recursively, which works fine, but I am afraid that
>> recursion can become inefficient for large hierarchies.
> 
> I've run into wanting to work with parallel directory structures
> before, and what I generally do is something like:
> 
> for root, dirs, files in os.walk( dir1 ):
>   dir2_root = dir2 + root[len(dir1):]
>   for f in files:
> dir1_path = os.path.join( root, f )
> dir2_path = os.path.join( dir2_root, f )
> 

Wouldn't it be better to implement tree traversing into a class, then
you can traverse two directory trees at once and can do funny things
with it?

Thomas

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failure building python 2.5 on mac os x 10.3.9

[Thomas Ploch]

Hello,

I followed the instructions in the Mac/README file.

I ran ./configure --enable-framework

But when I try to build from source with gcc 4.0.2, following happens:


[snip]
libtool: can't locate file for: -lSystemStubs
libtool: file: -lSystemStubs is not an object file (not allowed in a
library)
make: *** [Python.framework/Versions/2.5/Python] Error 1

What does that mean?

Thanks,
Thomas
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Understanding Python Source Code - where to start?

[Thomas Ploch]

Hello folks,
 
I am thinking about reading and understanding the Source Code of Python, but 
where would it be best to start? Possibly someone can give me a little hint. I 
am getting into socketmodule.c a little bit at the moment, but thats not what I 
want.
 
Greetz, Thomas
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Re: Tkinter & Python 2.5 Problems on MAC OS 10.3.9

[Thomas Ploch]

Kevin Walzer schrieb:

> Thomas Ploch wrote:
> > Hello folks,
> >
> > Since this is my first post on the list, a brief introduction of myself.
> >
> > My name is Thomas, I am 26 years old, I am a student of Computational
> > Linguistics and I am a python user. :-)
> >
> > Now my problem:
> >
> > I have Tcl/Tk 8.4.4 installed:
> >
> > iPimpG4:~ profipimp$ tclsh
> > % info patchlevel
> > 8.4.4
> > %
> >
> > But when I try to import Tkinter
> >
> >>>> import Tkinter
> > Traceback (most recent call last):
> >   File "", line 1, in 
> >   File
> > "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-tk/Tkinter.py",
> > line 38, in 
> > import _tkinter # If this fails your Python may not be configured
> > for Tk
> > ImportError: dlcompat: dyld:
> > /Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python
> > can't open library: /Library/Frameworks/Tk.framework/Versions/8.4/Tk
> > (No such file or directory, errno = 2)
> >
> >>>>
> >
> > ...this happens.
> >
> > Why?
> >
> > Tkinter worked perfectly with 2.3 and 2.4...
> >
> > Cheers,
> > Thomas
>
> Where is your installation of Tcl/Tk? It sounds like Python can't find it.
>
> Were you using the standard MacPython builds previously, or Unix-based
> builds from Fink or DarwinPorts?

I built python from source using gcc 4.0.1, but I have solved it by
installing a version of Tcl/TkAqua, now everything runs fine.

Still I dont know why that has happened. The fink directories are in
searchpath...

Thanks for your help,
Thomas

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Tkinter & Python 2.5 Problems on MAC OS 10.3.9

[Thomas Ploch]

Hello folks,

Since this is my first post on the list, a brief introduction of myself.

My name is Thomas, I am 26 years old, I am a student of Computational  
Linguistics and I am a python user. :-)

Now my problem:

I have Tcl/Tk 8.4.4 installed:

iPimpG4:~ profipimp$ tclsh
% info patchlevel
8.4.4
%

But when I try to import Tkinter

>>> import Tkinter
Traceback (most recent call last):
   File "", line 1, in 
   File  
"/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/lib-tk/Tkinter.py",
  
line 38, in 
 import _tkinter # If this fails your Python may not be configured for  
Tk
ImportError: dlcompat: dyld:  
/Library/Frameworks/Python.framework/Versions/2.5/Resources/Python.app/Contents/MacOS/Python
  
can't open library: /Library/Frameworks/Tk.framework/Versions/8.4/Tk  (No  
such file or directory, errno = 2)

>>>

...this happens.

Why?

Tkinter worked perfectly with 2.3 and 2.4...

Cheers,
Thomas
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