ANN: pyfcp
Hi all, pyfcp is a suite of tools, including a package, modules and applications, for accessing the Freenet network. What is freenet? Freenet - www.freenetproject.org - is a 'darknet' which supports anonymous publication and retrieval of websites and other media, in a way that makes it extremely expensive, if not impossible, for Big Brother to find out the source or requesters of any given files. pyfcp empowers python programmers to write applications which access the freenet network. Note that pyfcp only works with the new-generation 0.7 alpha freenet - it will not work with the current stable 0.5 version. But that is most certainly a plus :) pyfcp is available on the freenet website (downloads section), but also has its own website on the mainstream web: http://www.python.org/pyfcp as well as within freenet: freenet:[EMAIL PROTECTED],E9uFCy0NhiTbR0jVQkY77doaWtxTrkS9kuMrzOtNzSQ,AQABAAE/pyfcp/50/ Enjoy! -- Cheers aum -- http://mail.python.org/mailman/listinfo/python-list
Re: aligning SGML to text
Steven Bethard wrote:
> I have some plain text data and some SGML markup for that text that I
> need to align. (The SGML doesn't maintain the original whitespace, so I
> have to do some alignment; I can't just calculate the indices directly.)
[snip]
> Note that the SGML inserts spaces not only within the SGML elements, but
> also around punctuation.
[snip]
> I need to determine the indices in the original text that each SGML
> element corresponds to.
Ok, below is a working version that doesn't use regular expressions.
It's far from concise, but at least it doesn't fail like re does when I
have more than 100 words. =)
>>> import elementtree.ElementTree as etree
>>> def align(text, sgml):
... # convert SGML tree to words, and assemble a list of the
... # start word index and end word index for each SGML element
... sgml = sgml.replace('&', '&')
... tree = etree.fromstring('%s' % sgml)
... words = []
... if tree.text is not None:
... words.extend(tree.text.split())
... word_spans = []
... for elem in tree:
... elem_words = elem.text.split()
... start = len(words)
... end = start + len(elem_words)
... word_spans.append((start, end, elem.tag))
... words.extend(elem_words)
... if elem.tail is not None:
... words.extend(elem.tail.split())
... # determine the start character index and end character index
... # for each word from the SGML
... char_spans = []
... start = 0
... for word in words:
... while text[start:start + 1].isspace():
... start += 1
... end = start + len(word)
... assert text[start:end] == word, (text[start:end], word)
... char_spans.append((start, end))
... start = end
... # convert the word indices for each SGML element to
... # character indices
... for word_start, word_end, label in word_spans:
... start, _ = char_spans[word_start]
... _, end = char_spans[word_end - 1]
... yield label, start, end
...
>>> text = '''TNF binding induces release of AIP1 (DAB2IP) from TNFR1,
resulting in cytoplasmic translocation and concomitant formation of an
intracellular signaling complex comprised of TRADD, RIP1, TRAF2, and
AIPl.'''
>>> sgml = ''' TNF binding induces release of
AIP1 ( DAB2IP ) from
TNFR1 , resulting in cytoplasmic translocation and
concomitant formation of an intracellular signaling complex
comprised of TRADD , RIP1
, TRAF2 , and AIPl .
... '''
>>> list(align(text, sgml))
[('PROTEIN', 0, 3), ('PROTEIN', 31, 35), ('PROTEIN', 37, 43),
('PROTEIN', 50, 55), ('PROTEIN', 128, 159), ('PROTEIN', 173, 178),
('PROTEIN', 180, 184), ('PROTEIN', 186, 191)]
STeVe
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Re: Change value of element in list
O Plameras wrote: > Hi, > > I'm doing python tutorial, >> http://docs.python.org/tut/node5.html > > and I have these, > > lists = ['spam', 'eggs', 100, 1234] > lists[2] = lists[2] + 23 > > I expected this, > lists = ['spam', 'eggs', 123, 1234] > > but got this, > lists = ['spam', 'eggs', 100, 1234] > > What's my problem here ? > > I have Fedora C5 with python2.4. > > Thanks. > > O Plameras > I reply to my post to say it is my mistake. Before printing 'lists' I did not do this lists[2] = lists[2] + 23 Sorry for the bother. O Plameras -- http://mail.python.org/mailman/listinfo/python-list
Change value of element in list
Hi, I'm doing python tutorial, > http://docs.python.org/tut/node5.html and I have these, lists = ['spam', 'eggs', 100, 1234] lists[2] = lists[2] + 23 I expected this, lists = ['spam', 'eggs', 123, 1234] but got this, lists = ['spam', 'eggs', 100, 1234] What's my problem here ? I have Fedora C5 with python2.4. Thanks. O Plameras -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping None values to ''
Scott David Daniels wrote:
> Roberto Bonvallet wrote:
>> imho <[EMAIL PROTECTED]>:
>>> map(lambda x:"" , [i for i in [a,b,c] if i in ("None",None) ])
>> You don't need map when using list comprehensions:
>>["" for i in [a, b, c] if i in ("None", None)]
>>
> More like:
>
> [(i, "")[i in ("None", None)] for i in [a,b,c]]
Or in Python 2.5:
Python 2.5a2 (trunk:46491M, May 27 2006, 14:43:55) [MSC v.1310 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> a = 0
>>> b = None
>>> c = None
>>> a, b, c = ('' if x in (None, 'None') else x for x in (a, b, c))
>>> a, b, c
(0, '', '')
But someone please shoot me if I ever use something like that in
production code. ;)
STeVe
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Re: Getting output from external programs...
In article <[EMAIL PROTECTED]>, Ten <[EMAIL PROTECTED]> wrote: . . . >You can do this in various ways, ranging from the very simple and not very good > >from commands import getoutput > >x=getoutput(command) > > >- to your more common and better popens. > >ie: > >import popen2 > >(stdOut, stdIn) = popen2.popen4(command) > >x=stdOut.readlines() > >- asynchronously if appropriate. > >How are you running the command at the moment? . . . Why deprecate commands.getoutput()? Are you merely observing that it's applicable in fewer circumstances? -- http://mail.python.org/mailman/listinfo/python-list
Re: aligning SGML to text
Gerard Flanagan wrote:
> Steven Bethard wrote:
>> I have some plain text data and some SGML markup for that text that I
>> need to align. (The SGML doesn't maintain the original whitespace, so I
>> have to do some alignment; I can't just calculate the indices directly.)
>> For example, some of my text looks like:
>>
>> TNF binding induces release of AIP1 (DAB2IP) from TNFR1, resulting in
>> cytoplasmic translocation and concomitant formation of an intracellular
>> signaling complex comprised of TRADD, RIP1, TRAF2, and AIPl.
>>
>> And the corresponding SGML looks like:
>>
>> TNF binding induces release of AIP1
>> ( DAB2IP ) from TNFR1
>> , resulting in cytoplasmic translocation and concomitant
>> formation of an intracellular signaling complex
>> comprised of TRADD , RIP1 ,
>> TRAF2 , and AIPl .
>>
>> Note that the SGML inserts spaces not only within the SGML elements, but
>> also around punctuation.
>>
>>
>> I need to determine the indices in the original text that each SGML
>> element corresponds to. Here's some working code to do this, based on a
>> suggestion for a related problem by Fredrik Lundh[1]::
>>
>> def align(text, sgml):
>> sgml = sgml.replace('&', '&')
>> tree = etree.fromstring('%s' % sgml)
>> words = []
>> if tree.text is not None:
>> words.extend(tree.text.split())
>> word_indices = []
>> for elem in tree:
>> elem_words = elem.text.split()
>> start = len(words)
>> end = start + len(elem_words)
>> word_indices.append((start, end, elem.tag))
>> words.extend(elem_words)
>> if elem.tail is not None:
>> words.extend(elem.tail.split())
>> expr = '\s*'.join('(%s)' % re.escape(word) for word in words)
>> match = re.match(expr, text)
>> assert match is not None
>> for word_start, word_end, label in word_indices:
>> start = match.start(word_start + 1)
>> end = match.end(word_end)
>> yield label, start, end
>>
> [...]
>> >>> list(align(text, sgml))
>> [('PROTEIN', 0, 3), ('PROTEIN', 31, 35), ('PROTEIN', 37, 43),
>> ('PROTEIN', 50, 55), ('PROTEIN', 128, 159), ('PROTEIN', 173, 178),
>> ('PROTEIN', 180, 184), ('PROTEIN', 186, 191)]
>>
>> The problem is, this doesn't work when my text is long (which it is)
>> because regular expressions are limited to 100 groups. I get an error
>> like::
> [...]
>
> Steve
>
> This is probably an abuse of itertools...
>
> ---8<---
> text = '''TNF binding induces release of AIP1 (DAB2IP) from
> TNFR1, resulting in cytoplasmic translocation and concomitant
> formation of an intracellular signaling complex comprised of TRADD,
> RIP1, TRAF2, and AIPl.'''
>
> sgml = ''' TNF binding induces release of
> AIP1 ( DAB2IP ) from
> TNFR1 , resulting in cytoplasmic translocation
> and concomitant formation of an intracellular signaling
> complex comprised of TRADD ,
> RIP1 , TRAF2 , and AIPl .
> '''
>
> import itertools as it
> import string
>
> def scan(line):
> if not line: return
> line = line.strip()
> parts = string.split(line, '>', maxsplit=1)
> return parts[0]
>
> def align(txt,sml):
> i = 0
> for k,g in it.groupby(sml.split('<'),scan):
> g = list(g)
> if not g[0]: continue
> text = g[0].split('>')[1]#.replace('\n','')
> if k.startswith('/'):
> i += len(text)
> else:
> offset = len(text.strip())
> yield k, i, i+offset
> i += offset
>
> print list(align(text,sgml))
>
>
>
> [('PROTEIN', 0, 3), ('PROTEIN', 31, 35), ('PROTEIN', 38, 44),
> ('PROTEIN', 52, 57), ('PROTEIN', 131, 162), ('PROTEIN', 176, 181),
> ('PROTEIN', 184, 188), ('PROTEIN', 191, 196)]
>
> It's off because of the punctuation possibly, can't figure it out.
Thanks for taking a look. Yeah, the alignment's a big part of the
problem. It'd be really nice if the thing that gives me SGML didn't add
whitespace haphazardly. ;-)
STeVe
--
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Re: Chess module blog
make psyco entirely optional by putting it in a try/except block. change INITIAL_BOARD to be a triple-quoted string. you seem to mostly follow pep8, which is all most folks ask, but i really like this style for docstrings: def test(): ''' hello, this text and the quotes line up very nicely in a monospace font. ''' return pep8 says function names shouldn't be capitalized, and use underscores to separate words, so they can be distinguished from classes [which are CamelCase] quickly. i would make a few small functions inside adjudicate for each cmd case, then make a dict mapping 'fen' to the function fen, 'reset' to the function reset, etc. faster and more modular. Will McGugan wrote: > Hi folks, > > I have just blogged about a Python chess module of mine that I wrote a > while back. I plan on using it for a commerical project, but making the > module open source. So I would be interested in comments / advice > reagarding programming style and also optimization. > > http://www.willmcgugan.com/2006/06/18/chesspy/ > > Regards, > > Will McGugan > > -- > work: http://www.kelpiesoft.com > blog: http://www.willmcgugan.com -- http://mail.python.org/mailman/listinfo/python-list
Python with Eclipse
I've been trying to use Eclipse with Python on Linux for a while and have noticed something odd. After running the code or debugging a few times, its responsiveness gets really bad. Upon checking the equivalent of the task manager, I find several instances of Python running. When I kill these instances, the responsiveness comes back. I'm not sure if there is a better place to post this, but it is Python related. Is this just an issue with Eclipse or is there something else I should inspect? Any help would be appreciated. Regards, S Cook -- http://mail.python.org/mailman/listinfo/python-list
Re: Popen3 on Windows
Jeffrey Barish wrote:
> I have an application that has been working fine on Linux, but now I need to
> port it to Windows XP. The program uses Popen3 to run another program. I
> use Popen3 so that I can access the pid attribute, which I use to kill the
> auxiliary program when necessary. Popen3 does not exist on Windows. I see
> os.popen2 and os.popen3, but they provide only file objects for stdin,
> stdout, and stderr so I don't see a way to kill the auxiliary program that
> I start. Is there a way to do this on Windows?
> --
> Jeffrey Barish
>>>import subprocess
>>>x = subprocess.Popen('nc -l 2')
>>>x.pid
2783
>>>subprocess.Popen('taskkill %s' % x.pid)
>>> x.poll()
1
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Re: Getting output from external programs...
On Sunday 18 June 2006 21:28, ph0b0s wrote:
> Hi,
>
> i'm making an mp3 conversion program in Python, but am kind of stuck now.
> The conversion routines work, using LAME, but now a i'm building a GUI
> with GLADE around it, and would like to be able to show LAME's output
> to the user in a status window in my gui.. but don't know where to
> start...
>
> The command i use to invoke LAME is this :
>command = ("lame -b " + str(bitrate) + " " + infile + " \"" +
> dir_outpath + separator + outfile + "\"")
>
>
You can do this in various ways, ranging from the very simple and not very good
from commands import getoutput
x=getoutput(command)
- to your more common and better popens.
ie:
import popen2
(stdOut, stdIn) = popen2.popen4(command)
x=stdOut.readlines()
- asynchronously if appropriate.
How are you running the command at the moment?
--
There are 10 types of people in this world,
those who understand binary, and those who don't.
--
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Re: Simple script to make .png thumbnails from .zip archive...
hdante wrote: > there are too many ways to create a thumbnail from an > image. I'll cite one, using the "python image" external module, that > I've found to be very easy: > > import Image > def process(file): > try: > image = Image.open(file) > image.thumbnail ((128,128), Image.ANTIALIAS) > image.save (file + '.thumb.png') > except: > print 'Skipping file', file > > Links: > http://docs.python.org/lib/lib.html - Python Library Reference > http://www.pythonware.com/library/pil/handbook/image.htm - The Image > Module That, by the way, is the "PIL" library that you'll see a lot about -- The Python Imaging Library that the effbot is justly proud of. You won't do better than that. --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping None values to ''
Roberto Bonvallet wrote:
> imho <[EMAIL PROTECTED]>:
>> map(lambda x:"" , [i for i in [a,b,c] if i in ("None",None) ])
> You don't need map when using list comprehensions:
>["" for i in [a, b, c] if i in ("None", None)]
>
More like:
[(i, "")[i in ("None", None)] for i in [a,b,c]]
--
--Scott David Daniels
[EMAIL PROTECTED]
--
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Re: mapping None values to ''
"Roberto Bonvallet" <[EMAIL PROTECTED]> wrote:
> You don't need map when using list comprehensions:
>
> ["" for i in [a, b, c] if i in ("None", None)]
>
That loses list elements that aren't in the tests:
>>> a=7
>>> b="None"
>>> c=None
>>> ["" for i in [a,b,c] if i in ("None",None)]
['', '']
>>>
max
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Re: Seeking regex optimizer
Kay Schluehr wrote: > with reverse sorting as in your proposal.The naive solution is easy to > generate but I'm sceptical about its cost effectiveness. On the other > hand I do not want to investigate this matter if somebody else already > did it thoroughly. > > Regards, > Kay Hi Kay, The only way to know if something is optimised enough, is for you to test it in your application. If you haven't finished your application, then don't sweat it. take a note of your options, stick one in, then get the application finished. Its only when its finished that you can really say if further optimisations are necessary, and you would have to profile the complete prog to see where it's spending its time. I usually find myself using string methods where possible, then regular expressions only for things that string methods cannot do. When I finish my script I usually find that Pythons speed is adequate for most of my text processing tasks, or if speed IS an issue, then i needed to profile the completed application anyway. - Pad. -- http://mail.python.org/mailman/listinfo/python-list
Re: any subway web dev experiences
a wrote: > subway is pythons ruby on rails competitor > pls tell me if u hav any expereinces > thanks u wanna know reils n subway ur so kewl omg! no expereinces watsoevah, sori dud PS: If you want to be taken seriously, put at least some effort to make a readable english sentence. This is comp.lang.python, not Myspace. -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting values from text file
Thus spoke Dennis Lee Bieber (on 2006-06-18 22:37): > The only cure for that is complete and painful bone marrow > transplant As a start, after six months of no PERL go back and try > reading some of your code. Uhhh, this is like giving the mounted knight a longbow and push him onto the battlefield of Agincourt ;-) Regards Mirco -- http://mail.python.org/mailman/listinfo/python-list
Re: Seeking regex optimizer
Thus spoke Kay Schluehr (on 2006-06-18 19:07):
> I have a list of strings ls = [s_1,s_2,...,s_n] and want to create a
> regular expression sx from it, such that sx.match(s) yields a SRE_Match
> object when s starts with an s_i for one i in [0,...,n]. There might
> be relations between those strings: s_k.startswith(s_1) -> True or
> s_k.endswith(s_1) -> True. An extreme case would be ls = ['a', 'aa',
> ...,'...ab']. For this reason SRE_Match should provide the longest
> possible match.
With some ideas from Kay and Paddy, it tried to get
along with Python in doing this.
If its allowed to spread the individual strings
into alterations, the following would imho do:
#!/usr/bin/python
# -*- coding: iso-8859-15 -*-
text = r'this is a text containing aaaöüöaaaµaaa and more';
lstr = [
'a',
'aa',
'a',
'aaaöüöaaaµaaa',
'aaab'
]
import re
pat = re.compile(\
'(' + \
'|'.join(sorted(lstr,lambda a,b: len(b)-len(a))) + \
')', re.VERBOSE);
hits = sorted( pat.findall(text), lambda a,b: len(b)-len(a) )
print 'Longest: ', hits[0]
This will print 'aaaöüöaaaµaaa' from the text
and won't complain about specuial characters used.
in Perl, you could build up the regex
by dynamic evaluation (??{..}), but I
didn't manage to get this working in Python,
so here is (in Perl) how I thougt it would work:
my $text = "this is a text containing aaaöüöaaaµaaa and more";
my @lstr = (
'a',
'aa',
'a',
'aaaöüöaaaµaaa',
'aaab',
);
my $re = qr{
(??{
join '|',
map { quotemeta }
sort{ length $b <=> length $a }
@lstr
})
}x;
$_ = $text;
print "Longest: ", (my $hit) = reverse sort /$re/g;
Maybe the experts can bring some light to it.
Regards
Mirco
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Re: Passing data to system command
In article <[EMAIL PROTECTED]>,
Chris Hieronymus <[EMAIL PROTECTED]> wrote:
.
.
.
>input. How do I get the data into the system call? I used to do
>things in csh and awk,
>i.e., something like
>
>awk '{; print $1, $2}' filename | psxy options> >! output.ps
.
.
.
There are several aspects to what you're after. First, I think, is
to experiment with
import os
os.system("awk '{print $%column}'" % desired_column)
Does that move you forward?
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Re: Seeking regex optimizer
On 19/06/2006 6:30 AM, Paddy wrote:
> Kay Schluehr wrote:
>> I have a list of strings ls = [s_1,s_2,...,s_n] and want to create a
>> regular expression sx from it, such that sx.match(s) yields a SRE_Match
>> object when s starts with an s_i for one i in [0,...,n]. There might
>> be relations between those strings: s_k.startswith(s_1) -> True or
>> s_k.endswith(s_1) -> True.
Kay, what is the relevance of one string being a suffix of another? I
don't see how that could affect the outcome.
An extreme case would be ls = ['a', 'aa',
>> ...,'...ab']. For this reason SRE_Match should provide the longest
>> possible match.
>>
>> Is there a Python module able to create an optimized regex rx from ls
>> for the given constraints?
Optimised with respect to what? speed? ease of construction?
I presume that you will ensure that the members of the list are unique.
Note that the Python regex engine will consider each candidate in
Paddy's solution left to right until it gets a match or reaches the end
(that's why the reverse sort is needed to get longest possible match).
This is worst-case O(N) where N is the total of the lengths of all the
strings in your list.
As far as I can see, this is the only basic solution (modulo one or two
twiddles -- see below) using Python's re.
You could possibly consider producing "zzz|foo(?:bar)?|aaa" instead of
"zzz|foobar|foo|aaa" -- but whether that would run sufficiently faster
to offset the cost of construction is anybody's guess.
How many strings in your list? Average/maximum length? Likelihood of
ls[i].startswith(ls[j]) == True? unicode or str?
Your requirements are rather constrained: "sx.match(s) yields a
SRE_Match object" ... why do you need this? Surely all you need is
matched_len (which may be zero) such that s[:matched_len] is the matched
prefix.
I would have thought the way to approach this would be a simple
character-by-character tree/trie-driven lookup. This would be worst case
O(n) where n is the length of the longest string in your list. There may
well be a Python-callable gadget for this on the net somewhere. Google
"Danny Yoo ahocorasick" for a Python-callable solution to a similar but
more complex problem.
A cheap hack using Python's re: divide the problem according to first
character:
prefix_dict_match = {
'a': re.compile('alpaca|alligator').match,
'f': re.compile('foobar|foo').match,
'z': re.compile('zoo|zebra').match,
}
if s and s[0] in prefix_dict_match:
match_obj = prefix_dict_match[s[0]](s)
else:
match_obj = None
>>
>> Regards,
>> Kay
>
> A start would be:
> regexp = "^(" + "|".join(sorted(ls, reverse=True)) + ")"
> But the above does not work if you have special characters in your
> strings.
Paddy, fixing that problem, and "optimising" by removing the redundant
^() metacharacters:
regexp = "|".join(map(re.escape, sorted(ls, reverse=True)))
Hoping some of this helps,
Regards,
John
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Re: Passing data to system command
import os, subprocess
xys = [[1,2],[3,4]]
msg = '\n'.join([str(x) + ',' + str(y) for x, y in xys])
os.popen('command', 'w').write(msg)
os.popen2('command')[0].write(msg)
p = subprocess.Popen('command', stdin=subprocess.PIPE)
p.stdin.write(msg)
help(subprocess)
help(os.popen)
help(os.popen3)
Chris Hieronymus wrote:
> Hi,
>
> I have a bunch of x-y data contained in an array. I would like to
> plot the data using an
> external program (psxy in GMT). The plotting program takes x-y
> couples as standard
> input. How do I get the data into the system call? I used to do
> things in csh and awk,
> i.e., something like
>
> awk '{; print $1, $2}' filename | psxy options> >! output.ps
>
> The reason I'm trying to use python is because the manipulations are
> getting too cumbersome
> in awk. Now I have all the manipulations done in python, but I'm
> missing that last step.
>
> I've tried various things with os.system, popen, and subprocess, but
> so far without success.
> Does anyone know how to do this?
>
> chris
>
>
>
> ---
> Christoph
> Hieronymus
> [EMAIL PROTECTED]
> Associate
> Professor
> phone: (+46) 18-471 2383
> Uppsala
> University
>fax: (+46) 18-501 110
> Dept. of Earth Sciences (Geophysics)
> Villavägen 16
> SE-752 36 Uppsala, Sweden
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Re: Passing data to system command
Should be like this:
from subprocess import Popen, PIPE
my_output = file('output1.ps', 'w')
p1 = Popen(["psxy"], stdin = PIPE, stdout=my_output)
p1.stdin.write(my_format(array))
p1.communicate()
my_output.close()
I've never used that, though, please tell us if it worked.
Chris Hieronymus wrote:
> Hi,
>
> I have a bunch of x-y data contained in an array. I would like to
> plot the data using an
> external program (psxy in GMT). The plotting program takes x-y
> couples as standard
> input. How do I get the data into the system call? I used to do
> things in csh and awk,
> i.e., something like
>
> awk '{; print $1, $2}' filename | psxy options> >! output.ps
>
> The reason I'm trying to use python is because the manipulations are
> getting too cumbersome
> in awk. Now I have all the manipulations done in python, but I'm
> missing that last step.
>
> I've tried various things with os.system, popen, and subprocess, but
> so far without success.
> Does anyone know how to do this?
>
> chris
>
>
>
> ---
> Christoph
> Hieronymus
> [EMAIL PROTECTED]
> Associate
> Professor
> phone: (+46) 18-471 2383
> Uppsala
> University
>fax: (+46) 18-501 110
> Dept. of Earth Sciences (Geophysics)
> Villavägen 16
> SE-752 36 Uppsala, Sweden
--
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Re: code is data
> > > community has no interest in it. When I absolutely need macros, I will > > > go elsewhere. > I *like* 1..5 (ada, ruby) instead of range(5). If I had macros, I would > have done it myself for *my* code. I think this example more is a symptom of a childish need to get things your way than of a deficiency in Python. BTW, range(5) = 0..4 in Ada and Ruby. You said "when I absolutely need macros" but none of your examples demonstrate any "absolute need." I can't see your point. -- mvh Björn -- http://mail.python.org/mailman/listinfo/python-list
Re: Seeking regex optimizer
Paddy wrote:
> Kay Schluehr wrote:
> > I have a list of strings ls = [s_1,s_2,...,s_n] and want to create a
> > regular expression sx from it, such that sx.match(s) yields a SRE_Match
> > object when s starts with an s_i for one i in [0,...,n]. There might
> > be relations between those strings: s_k.startswith(s_1) -> True or
> > s_k.endswith(s_1) -> True. An extreme case would be ls = ['a', 'aa',
> > ...,'...ab']. For this reason SRE_Match should provide the longest
> > possible match.
> >
> > Is there a Python module able to create an optimized regex rx from ls
> > for the given constraints?
> >
> > Regards,
> > Kay
>
> A start would be:
> regexp = "^(" + "|".join(sorted(ls, reverse=True)) + ")"
> But the above does not work if you have special characters in your
> strings.
For special characters there might be a workaround using escapes. This
is indeed important, but I do think one should split the problem into
separate parts.
> You say you want something that is optimised. What have have you tried?
Sorting the list and checking for successor inclusions. Say you have ls
= ['x','a', 'aa', 'aab' ,'ab']
This can be mapped to:
'x|a(?:(?:ab)?|b?|a?)'
or to:
'^(x|ab|aab|aa|a)'
with reverse sorting as in your proposal.The naive solution is easy to
generate but I'm sceptical about its cost effectiveness. On the other
hand I do not want to investigate this matter if somebody else already
did it thoroughly.
Regards,
Kay
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Re: wxPython GUI designer
Are there any good commercial project built with wx ? I am a newbie and a have to write a small application in Python. I was wondering which optin would be best for me in terms of least learning curve and getting the final product ASAP. Thanks DH wrote: > In my opinion none of the wx* or gtk* related designer tools are > any good. QT Designer (which can be used with pyqt) is excellent, > however, you probably would only want to use that if you are > developing non-commercial software or else can afford a commercial > license from Trolltech. For wx and gtk projects, I usually just write > the gui by hand like you have already been doing. -- http://mail.python.org/mailman/listinfo/python-list
any subway web dev experiences
subway is pythons ruby on rails competitor pls tell me if u hav any expereinces thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: USB support
Thanks for this, I have managed to build PyUSB and install it in the relevant directory. However I get bus errors when I try the PlugUSB.py example. Does anyone know why this is likely to be the case? I am using Macpython 2.4, Libusb 0.1.12 and PyUSB 0.3.3 on an Intel based mac. Thanks in advance. Rod Tim Roberts wrote: > "rodmc" <[EMAIL PROTECTED]> wrote: > > > >I need to write a program which can access the USB ports on Mac and > >Linux, is there a library available for Python? > > The "stable" version of Libusb includes a Python binding. The version in > development does not yet. > -- > - Tim Roberts, [EMAIL PROTECTED] > Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping None values to ''
imho <[EMAIL PROTECTED]>:
> map(lambda x:"" , [i for i in [a,b,c] if i in ("None",None) ])
You don't need map when using list comprehensions:
["" for i in [a, b, c] if i in ("None", None)]
--
Roberto Bonvallet
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Re: Simple script to make .png thumbnails from .zip archive...
Hi,
I don't know zipfile by heart, but python official documentation is
always good ( docs.python.org ). You need a loop in the file list like
this:
for file in zip:
process(file)
Unfortunatelly, there are too many ways to create a thumbnail from an
image. I'll cite one, using the "python image" external module, that
I've found to be very easy:
import Image
def process(file):
try:
image = Image.open(file)
image.thumbnail ((128,128), Image.ANTIALIAS)
image.save (file + '.thumb.png')
except:
print 'Skipping file', file
Links:
http://docs.python.org/lib/lib.html - Python Library Reference
http://www.pythonware.com/library/pil/handbook/image.htm - The Image
Module
K P S wrote:
> Hi.
> I'm looking for a small script that will take a .zip archive and pull
> the first .jpg from the archive and convert it to a .png.
>
> The reason for this is I want to have tuhmbnails for these archives in
> nautilus under gnome. I would like something similar to the following
> code, which will pull a thumbnail from an openoffice.org (oasis)
> document. What I want is a little more involved, I guess, since I
> don't know the name of the file (for the zip.read command), and I need
> to convert the file from .jpg to .png once I get it. Any help would be
> appreciated. Including a pointer to a web page of a manual with
> examples. :-)
>
> #!/usr/bin/python
>
> import zipfile
> import sys
> import gnomevfs
>
> inURL=gnomevfs.get_local_path_from_uri(sys.argv[1])
> outURL=sys.argv[2]
>
> zip=zipfile.ZipFile(inURL,mode="r")
> picture=zip.read("Thumbnails/thumbnail.png")
> thumbnail=open(outURL,"w")
> thumbnail.write(picture)
> thumbnail.write("/n")
> zip.close()
> thumbnail.close()
--
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Re: aligning SGML to text
Steven Bethard wrote:
> I have some plain text data and some SGML markup for that text that I
> need to align. (The SGML doesn't maintain the original whitespace, so I
> have to do some alignment; I can't just calculate the indices directly.)
> For example, some of my text looks like:
>
> TNF binding induces release of AIP1 (DAB2IP) from TNFR1, resulting in
> cytoplasmic translocation and concomitant formation of an intracellular
> signaling complex comprised of TRADD, RIP1, TRAF2, and AIPl.
>
> And the corresponding SGML looks like:
>
> TNF binding induces release of AIP1
> ( DAB2IP ) from TNFR1
> , resulting in cytoplasmic translocation and concomitant
> formation of an intracellular signaling complex
> comprised of TRADD , RIP1 ,
> TRAF2 , and AIPl .
>
> Note that the SGML inserts spaces not only within the SGML elements, but
> also around punctuation.
>
>
> I need to determine the indices in the original text that each SGML
> element corresponds to. Here's some working code to do this, based on a
> suggestion for a related problem by Fredrik Lundh[1]::
>
> def align(text, sgml):
> sgml = sgml.replace('&', '&')
> tree = etree.fromstring('%s' % sgml)
> words = []
> if tree.text is not None:
> words.extend(tree.text.split())
> word_indices = []
> for elem in tree:
> elem_words = elem.text.split()
> start = len(words)
> end = start + len(elem_words)
> word_indices.append((start, end, elem.tag))
> words.extend(elem_words)
> if elem.tail is not None:
> words.extend(elem.tail.split())
> expr = '\s*'.join('(%s)' % re.escape(word) for word in words)
> match = re.match(expr, text)
> assert match is not None
> for word_start, word_end, label in word_indices:
> start = match.start(word_start + 1)
> end = match.end(word_end)
> yield label, start, end
>
[...]
> >>> list(align(text, sgml))
> [('PROTEIN', 0, 3), ('PROTEIN', 31, 35), ('PROTEIN', 37, 43),
> ('PROTEIN', 50, 55), ('PROTEIN', 128, 159), ('PROTEIN', 173, 178),
> ('PROTEIN', 180, 184), ('PROTEIN', 186, 191)]
>
> The problem is, this doesn't work when my text is long (which it is)
> because regular expressions are limited to 100 groups. I get an error
> like::
[...]
Steve
This is probably an abuse of itertools...
---8<---
text = '''TNF binding induces release of AIP1 (DAB2IP) from
TNFR1, resulting in cytoplasmic translocation and concomitant
formation of an intracellular signaling complex comprised of TRADD,
RIP1, TRAF2, and AIPl.'''
sgml = ''' TNF binding induces release of
AIP1 ( DAB2IP ) from
TNFR1 , resulting in cytoplasmic translocation
and concomitant formation of an intracellular signaling
complex comprised of TRADD ,
RIP1 , TRAF2 , and AIPl .
'''
import itertools as it
import string
def scan(line):
if not line: return
line = line.strip()
parts = string.split(line, '>', maxsplit=1)
return parts[0]
def align(txt,sml):
i = 0
for k,g in it.groupby(sml.split('<'),scan):
g = list(g)
if not g[0]: continue
text = g[0].split('>')[1]#.replace('\n','')
if k.startswith('/'):
i += len(text)
else:
offset = len(text.strip())
yield k, i, i+offset
i += offset
print list(align(text,sgml))
[('PROTEIN', 0, 3), ('PROTEIN', 31, 35), ('PROTEIN', 38, 44),
('PROTEIN', 52, 57), ('PROTEIN', 131, 162), ('PROTEIN', 176, 181),
('PROTEIN', 184, 188), ('PROTEIN', 191, 196)]
It's off because of the punctuation possibly, can't figure it out.
maybe you can tweak it?
hth
Gerard
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Re: Seeking regex optimizer
Kay Schluehr wrote:
> I have a list of strings ls = [s_1,s_2,...,s_n] and want to create a
> regular expression sx from it, such that sx.match(s) yields a SRE_Match
> object when s starts with an s_i for one i in [0,...,n]. There might
> be relations between those strings: s_k.startswith(s_1) -> True or
> s_k.endswith(s_1) -> True. An extreme case would be ls = ['a', 'aa',
> ...,'...ab']. For this reason SRE_Match should provide the longest
> possible match.
>
> Is there a Python module able to create an optimized regex rx from ls
> for the given constraints?
>
> Regards,
> Kay
A start would be:
regexp = "^(" + "|".join(sorted(ls, reverse=True)) + ")"
But the above does not work if you have special characters in your
strings.
You say you want something that is optimised. What have have you tried?
- Pad.
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Do you know good source codes to study?
Hi guys, I am about to finish reading the book "Learning Python" which is published by O'reilly. This is a good book and I get basic knowledge of Python from it. I think it's time to read good source codes for the next step. It might be great to join some open source projects. So, do you guys know any good code I can get free? I am thinking of Zope, but It seems to be big for me. Thanks, Rintaro Masuda -- http://mail.python.org/mailman/listinfo/python-list
Getting output from external programs...
Hi,
i'm making an mp3 conversion program in Python, but am kind of stuck
now.
The conversion routines work, using LAME, but now a i'm building a GUI
with GLADE around it, and would like to be able to show LAME's output
to the user in a status window in my gui.. but don't know where to
start...
The command i use to invoke LAME is this :
command = ("lame -b " +
str(bitrate) + " " + infile + " \"" + dir_outpath + separator + outfile
+ "\"")
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Re: wxPython GUI designer
[EMAIL PROTECTED] wrote: > I am newbie learning wxPython. I tried using GUI designer called > wxGlade. When it generated code I couldnt get the same level of > flexibility as writing the code by oneself. > > Any view on what you think about using GUI designer tools. > > Every help is appreciated. > In my opinion none of the wx* or gtk* related designer tools are any good. QT Designer (which can be used with pyqt) is excellent, however, you probably would only want to use that if you are developing non-commercial software or else can afford a commercial license from Trolltech. For wx and gtk projects, I usually just write the gui by hand like you have already been doing. -- http://mail.python.org/mailman/listinfo/python-list
wxPython GUI designer
I am newbie learning wxPython. I tried using GUI designer called wxGlade. When it generated code I couldnt get the same level of flexibility as writing the code by oneself. Any view on what you think about using GUI designer tools. Every help is appreciated. -- http://mail.python.org/mailman/listinfo/python-list
Re: debugging in eclipse+pydev
Hi,On 18 Jun 2006 07:46:48 -0700, yaru22 <[EMAIL PROTECTED]> wrote: Hi.I'd like to know how to debug in eclipse+pydev.In the menu, "Pydev Debug", there's Start Debug Server option, but Idon't know how to use it.Few questions I have about debugging are: 1) how do i set a breakpoints in pydev?2) how do i execute the code line by line? I mean... step into, stepover, and so on...Can anyone give me a small tutorial as to how to debug in Eclipse +Pydev please? That 'start debug server' is for remote debugging. Check: http://fabioz.com/pydev/manual_adv_remote_debugger.htmlFor the 'regular' debugger. Check http://fabioz.com/pydev/manual_adv_debugger.html. There is also a 'quick' screencast featuring it at http://showmedo.com/videos/video?name=PydevEclipseFabio&fromSeriesID=8&index=0 (takes you from configuring pydev until the point where you can debug it).Cheers,Fabio -- http://mail.python.org/mailman/listinfo/python-list
Re: import hook
Thomas Heller wrote: > There are also other ways. You could extend __path__ of foo, and the > pkgutil module might also be useful. The __path__ trick worked nicely, thanks. Here is the code in case anyone is interested # Allow veusz to be run even if not installed into PYTHONPATH try: import veusz except ImportError: # load in the veusz module, but change its path to # the veusz directory, and insert it into sys.modules import __init__ as veusz thisdir = os.path.dirname( os.path.abspath(__file__) ) veusz.__path__ = [thisdir] veusz.__name__ = 'veusz' sys.modules['veusz'] = veusz This is part of the main program. If it can't import it (i.e. it is not installed), it imports the __init__ module, renames it, and corrects its path, then sticks it into the list of imported modules. Jeremy -- Jeremy Sanders http://www.jeremysanders.net/ -- http://mail.python.org/mailman/listinfo/python-list
Simple script to make .png thumbnails from .zip archive...
Hi.
I'm looking for a small script that will take a .zip archive and pull
the first .jpg from the archive and convert it to a .png.
The reason for this is I want to have tuhmbnails for these archives in
nautilus under gnome. I would like something similar to the following
code, which will pull a thumbnail from an openoffice.org (oasis)
document. What I want is a little more involved, I guess, since I
don't know the name of the file (for the zip.read command), and I need
to convert the file from .jpg to .png once I get it. Any help would be
appreciated. Including a pointer to a web page of a manual with
examples. :-)
#!/usr/bin/python
import zipfile
import sys
import gnomevfs
inURL=gnomevfs.get_local_path_from_uri(sys.argv[1])
outURL=sys.argv[2]
zip=zipfile.ZipFile(inURL,mode="r")
picture=zip.read("Thumbnails/thumbnail.png")
thumbnail=open(outURL,"w")
thumbnail.write(picture)
thumbnail.write("/n")
zip.close()
thumbnail.close()
--
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Re: code is data
Ravi Teja <[EMAIL PROTECTED]> said: > I *like* 1..5 (ada, ruby) instead of range(5). If I had macros, I would > have done it myself for *my* code. You can write your own preprocessor to handle things like that. -- Roberto Bonvallet -- http://mail.python.org/mailman/listinfo/python-list
Re: code is data
Fredrik Lundh wrote:
> Ravi Teja wrote:
>
> > Web frameworks, which seem to be the rage now in Python community could
> > have benefited tremendously from Macro capabilities since they have a
> > lot of boiler plate.
>
> they do? methinks you haven't done much web programming lately...
>
>
You blogged on Django. Let's use that. Don't you think model creation
in Django can be represented better, given that it is done often
enough?
Let's take an example from the official tutorial
from
http://www.djangoproject.com/documentation/tutorial1/#creating-models
class Poll(models.Model):
question = models.CharField(maxlength=200)
pub_date = models.DateTimeField('date published')
class Choice(models.Model):
poll = models.ForeignKey(Poll)
choice = models.CharField(maxlength=200)
votes = models.IntegerField()
I don't use Django and I made this up quickly, so please don't pick on
subtleties.
@Poll:
question: char length 200
pub_date('date published'): date
@Choice:
poll -> Poll
choice: char length 200
votes: int
The following is my rationale. Annoted variables, symbols and code
layout visually cue more efficiently to the object nature than do
explicit text definitions. Of course, this is only sensible when there
aren't too many of any of those. In that case, the cognitive cost of
notation outweighs the representational cost of text.
Representational minimalism is troublesome in general code (ala Perl),
but not so in a DSL where the context is constrained.
I would also like to symbolize field types since they occur so commonly
in a definition file and only a few of them are commonly used. I admit
though that I find the code below a bit visually jarring and I might
use something else. But it serves to illustrate the point. I chose the
respective symbols based on their colloquial use and association with
the field types.
@Poll:
$question: length 200
%pub_date('date published')
@Choice:
poll -> Poll
$choice: length 200
#votes
Since you are on thread and are a prominent and involved member of the
Python community, I would like it if you (or any such other) can
provide feedback on the rest of my previous post rather than be
dismissive by just a small portion of it. Perhaps, that will give me
some insight how these language design decisions are rationally made (I
am not strictly a programmer by profession, much less a language
designer).
--
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Re: Extracting values from text file
On Sun, 18 Jun 2006 17:46:43 +0200 Mirco Wahab <[EMAIL PROTECTED]> wrote: > Thus spoke Preben Randhol (on 2006-06-18 13:34): > > On Sun, 18 Jun 2006 10:54:01 +0200 > > Mirco Wahab <[EMAIL PROTECTED]> wrote: > >> - no DWIM-ism (do what I mean) on 'value' addition > > > > But you don't add two values. you add two strings. If you > > want numbers you must convert the strings. > > Why? At least - if its obvious, what I want. If I say: I want something to eat. Can you know if I want a dessert or a dinner ? ;-) My point is that you don't specify. In your case you show that pyhton is polymorphic, and that can have side-effects... Since in Python you cannot define what type a function should accept you can throw anything to it and it will happily much at it as best it can. Computers are dumb and it is better that one give them enough instructions than to let them second guess you IMHO My other language of choice is Ada. Ada is quite the opposite of Python in being a very strictly typed language. It takes some getting used to Python for me ;-) In my opinion Ada95 & Ada2005 got strict typing correct, while Java only partially is strictly typed. C/C++ is not. Anyway Ada and Python has different targets so I can happily play with both static and dynamic typing. I can recommend Ada as it will teach you to a very good programming style that can be used when using other language. -- http://mail.python.org/mailman/listinfo/python-list
aligning SGML to text
I have some plain text data and some SGML markup for that text that I
need to align. (The SGML doesn't maintain the original whitespace, so I
have to do some alignment; I can't just calculate the indices directly.)
For example, some of my text looks like:
TNF binding induces release of AIP1 (DAB2IP) from TNFR1, resulting in
cytoplasmic translocation and concomitant formation of an intracellular
signaling complex comprised of TRADD, RIP1, TRAF2, and AIPl.
And the corresponding SGML looks like:
TNF binding induces release of AIP1
( DAB2IP ) from TNFR1
, resulting in cytoplasmic translocation and concomitant
formation of an intracellular signaling complex
comprised of TRADD , RIP1 ,
TRAF2 , and AIPl .
Note that the SGML inserts spaces not only within the SGML elements, but
also around punctuation.
I need to determine the indices in the original text that each SGML
element corresponds to. Here's some working code to do this, based on a
suggestion for a related problem by Fredrik Lundh[1]::
def align(text, sgml):
sgml = sgml.replace('&', '&')
tree = etree.fromstring('%s' % sgml)
words = []
if tree.text is not None:
words.extend(tree.text.split())
word_indices = []
for elem in tree:
elem_words = elem.text.split()
start = len(words)
end = start + len(elem_words)
word_indices.append((start, end, elem.tag))
words.extend(elem_words)
if elem.tail is not None:
words.extend(elem.tail.split())
expr = '\s*'.join('(%s)' % re.escape(word) for word in words)
match = re.match(expr, text)
assert match is not None
for word_start, word_end, label in word_indices:
start = match.start(word_start + 1)
end = match.end(word_end)
yield label, start, end
>>> text = '''TNF binding induces release of AIP1 (DAB2IP) from
TNFR1, resulting in cytoplasmic translocation and concomitant
formation of an intracellular signaling complex comprised of TRADD,
RIP1, TRAF2, and AIPl.'''
>>> sgml = ''' TNF binding induces release of
AIP1 ( DAB2IP ) from
TNFR1 , resulting in cytoplasmic translocation
and concomitant formation of an intracellular signaling
complex comprised of TRADD ,
RIP1 , TRAF2 , and AIPl .
'''
>>> list(align(text, sgml))
[('PROTEIN', 0, 3), ('PROTEIN', 31, 35), ('PROTEIN', 37, 43),
('PROTEIN', 50, 55), ('PROTEIN', 128, 159), ('PROTEIN', 173, 178),
('PROTEIN', 180, 184), ('PROTEIN', 186, 191)]
The problem is, this doesn't work when my text is long (which it is)
because regular expressions are limited to 100 groups. I get an error
like::
Traceback (most recent call last):
...
AssertionError: sorry, but this version only supports 100 named
groups
I also played around with difflib.SequenceMatcher for a while, but
couldn't get a solution based on that working. Any suggestions?
[1]http://mail.python.org/pipermail/python-list/2005-December/313388.html
Thanks,
STeVe
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Passing data to system command
Hi,
I have a bunch of x-y data contained in an array. I would like to
plot the data using an
external program (psxy in GMT). The plotting program takes x-y
couples as standard
input. How do I get the data into the system call? I used to do
things in csh and awk,
i.e., something like
awk '{; print $1, $2}' filename | psxy >! output.ps
The reason I'm trying to use python is because the manipulations are
getting too cumbersome
in awk. Now I have all the manipulations done in python, but I'm
missing that last step.
I've tried various things with os.system, popen, and subprocess, but
so far without success.
Does anyone know how to do this?
chris
---
Christoph
Hieronymus
[EMAIL PROTECTED]
Associate
Professor
phone: (+46) 18-471 2383
Uppsala
University
fax: (+46) 18-501 110
Dept. of Earth Sciences (Geophysics)
Villavägen 16
SE-752 36 Uppsala, Sweden
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Re: maximum integer length?
On 2006-06-18, Grant Edwards <[EMAIL PROTECTED]> wrote: >> Que? An integer is just a whole number without fraction. What are you >> talking about? > > He's talking about decimal digits. Each decimal digit takes up > 3.322 bits. A byte can hold about 2.4 digits. 400MB should be > able to hold an integer with about 1,010,000,000 decimal > digits. Oops. The real answer is 15/16 of that. I didn't realize that the integer representation only uses 15 of 16 bits. -- Grant Edwards [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: download file from intranet linux server to windows clients
In article <[EMAIL PROTECTED]>, Luis P. Mendes <[EMAIL PROTECTED]> wrote: . . . >I'm building an intranet web server in Linux for around 40 windows >clients with Django. > >The problem is that I want to build an excel file based on criteria >entered by the client, that the client must be able do download to his >personal work space. I use pyExcelerator to create the Excel files. > >How can I do it? Do I need another excel generator? > >Client's information about its working directory should be read, but >how? I could only find the way to read the server environment >variables, where data is processed. . . . We do a lot of this--dynamic construction on the server-side of Excel documents, delivered as Web pages. My impression is that you're working too hard: don't bother worrying about where "the client's workspace" is; just let the browser manage all that. Browsers are adequate or better at downloading. -- http://mail.python.org/mailman/listinfo/python-list
Chess module blog
Hi folks, I have just blogged about a Python chess module of mine that I wrote a while back. I plan on using it for a commerical project, but making the module open source. So I would be interested in comments / advice reagarding programming style and also optimization. http://www.willmcgugan.com/2006/06/18/chesspy/ Regards, Will McGugan -- work: http://www.kelpiesoft.com blog: http://www.willmcgugan.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting values from text file
Thus spoke Marc 'BlackJack' Rintsch (on 2006-06-18 18:54): > In <[EMAIL PROTECTED]>, Mirco Wahab wrote: >> they use the _same_ operator (+) for number _addition_ >> and string _concatenation_, which is, imho, cumbersome. > > And ``+`` means also list/tuple concatenation and really anything for user > defined types. > >> If you have an operator with meaning "add numbers" (+) >> and one for "add strings" (.), the language could then >> do the obvious for you. > > The dot also has already a meaning, it's the attribute lookup operator. Yes, that may be the real reason? >> Why would one go from C/C++ to "dynamical typed" >> things, if he has to be so explicit on easy >> things? > > Strings that act sometimes as strings and sometimes as numbers when used > with ``+`` are quite confusing. No, thats not what I tried to say, it's rather: /things/ act _always_ as strings and _always_ as numbers _when used_ as a 'string' or as a 'number'. I don't consider that one 'confusing'. > Two relevant lines from the Zen of Python: > Explicit is better than implicit. > In the face of ambiguity, refuse the temptation to guess. This is, iirc, /exactly/ the reason why in (e.g.) Perl they put sigils ($%@) in front of the variables. So all gets explicit - there's no more ambiguity ... > And don't mix up weakly and dynamically typed. > Python is dynamically and strictly typed. OK, right. I didn't separate 'strict' from 'weak' regarding data types. I think I got used too much to these nice 'backhand conversions'. I'm sure I wouldn't have blinked once if I had gone directly from C++ (or Java) to Python, but now I have still the Perl disease in my bones ;-) Regards Mirco -- http://mail.python.org/mailman/listinfo/python-list
Re: code is data
Ravi Teja wrote: > Web frameworks, which seem to be the rage now in Python community could > have benefited tremendously from Macro capabilities since they have a > lot of boiler plate. they do? methinks you haven't done much web programming lately... -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping None values to ''
On Sun, 18 Jun 2006 07:37:00 -0500, Tim Chase <[EMAIL PROTECTED]> wrote:
>> i wish to map None or "None" values to "".
>> eg
>> a = None
>> b = None
>> c = "None"
>>
>> map( , [i for i in [a,b,c] if i in ("None",None) ])
>>
>> I can't seem to find a way to put all values to "". Can anyone help?
>> thanks
>
>I'd consider this a VeryBadIdea(tm). However, given Python's
>introspective superpowers, it *can* be done (even if it most
>likely *shouldn't* be done). That caveat out of the way, here goes:
>
> >>> for scope in [locals, globals]:
>... s = scope()
>... for vbl, value in s.items():
>... if value == None or (type(value) == type("") and
>value == 'None'):
>... s[vbl] = ''
>
Hey Tim,
Actually this doesn't work for locals at all:
>>> def f():
... x = 'x'
... locals()['x'] = 'y'
... print x
...
>>> f()
x
>>>
Locals cannot be modified through the dict returned by locals().
>
>There may be some better way to determing whether an item is a
>string than my off-the-cufff
>
> type(value) == type("")
>
Yes. isinstance(value, str) is the best way to do this.
Jean-Paul
--
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Re: code is data
Paddy wrote: > Ravi Teja wrote: > > BJörn Lindqvist wrote: > > > > Personally, I would like to see macros in Python (actually Logix > > > > succeeding is good enough). But I am no language designer and the > > > > community has no interest in it. When I absolutely need macros, I will > > > > go elsewhere. > > > > > > One must wonder, when is that? When do you absolutely need macros? > > > > Whenever there is significant boiler plate code that functions and > > classes cannot eliminate alone. > > Whenever there is a more elegant way to express your code. > > > > Me, I am torn. I should now better. I have listened to the arguments > against Macros in Python and the ones that struck home were the > argument for maintainability: > Without macros, Python is Python. Statements do what you expect. Yes! I heard those arguments too. And I am not convinced. Static language programmer: Lack of static typing removes the necessary safeguards. The code is more error prone. Objects have behavior that is not obvious. Dynamic language programmer: Really? I don't seem to have any more bugs than in my statically typed code. And my code is compact and reads better. I don't want to go back. No to macros proponent: Macros introduce a lot of potential for abuse. Code will be worse to read than Perl. Macros proponent: Really? We have been doing macros for decades. We all think our code is better for macros, not worse. We are not going back. I just don't get it. Don't we often invoke the "We are all adults here" argument. Writing a macro is not as simple as writing a function. Sort of like metaclasses. Many will stay off them. Those that really need them will walk that extra mile. Don't we all believe that "Simple should be possible. Complex should be doable" > And the argument against DSLs altogether: > Make Python your DSL! If you design your own DSL before long you start > to embellish it with more statements or data types and before long it > becomes complex. If you used Python from the beginning then you would > have a community for support. Python has a low cognitive overhead. But it not a DSL by definition. No language can be. The idea is that when the domain changes, a DSL should be driven by the new domain as warranted. In other words, driven "by the problem, not the tool". I don't want "a DSL". I want a language that allows me to make "my DSL" based on it. That means I don't loose the community connection. I can still use all the rich libraries in my DSL. I like Python for its indentation syntax, sensible semantics and readability. I invested a lot of time in Python. After much language hopping, I settled with Python. I like the community and the code base available for it. The libraries just seem to be designed at the right level of abstraction for me (as opposed to say, Java). When I need to do something, I know where to go. But all this ties me to the language tightly that I cannot change. > I know the arguments, but every once in a while I think if only I could > craft my own ??? statement or My thoughts exactly. Web frameworks, which seem to be the rage now in Python community could have benefited tremendously from Macro capabilities since they have a lot of boiler plate. -- http://mail.python.org/mailman/listinfo/python-list
Seeking regex optimizer
I have a list of strings ls = [s_1,s_2,...,s_n] and want to create a regular expression sx from it, such that sx.match(s) yields a SRE_Match object when s starts with an s_i for one i in [0,...,n]. There might be relations between those strings: s_k.startswith(s_1) -> True or s_k.endswith(s_1) -> True. An extreme case would be ls = ['a', 'aa', ...,'...ab']. For this reason SRE_Match should provide the longest possible match. Is there a Python module able to create an optimized regex rx from ls for the given constraints? Regards, Kay -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting values from text file
In <[EMAIL PROTECTED]>, Mirco Wahab wrote: > You see the picture? Pythons designer made the > same mistake as the Java/Javascript designer - > they use the _same_ operator (+) for number _addition_ > and string _concatenation_, which is, imho, cumbersome. And ``+`` means also list/tuple concatenation and really anything for user defined types. > If you have an operator with meaning "add numbers" (+) > and one for "add strings" (.), the language could then > do the obvious for you. The dot also has already a meaning, it's the attribute lookup operator. > Why would one go from C/C++ to "dynamical typed" > things, if he has to be so explicit on easy > things? Strings that act sometimes as strings and sometimes as numbers when used with ``+`` are quite confusing. Two relevant lines from the Zen of Python: Explicit is better than implicit. In the face of ambiguity, refuse the temptation to guess. And don't mix up weakly and dynamically typed. Python is dynamically and strictly typed. Ciao, Marc 'BlackJack' Rintsch -- http://mail.python.org/mailman/listinfo/python-list
Re: Tetris
Devon G. Parks wrote: > I've been searching google and this group for a while now for a good > tutorial on making a Tetris-style game in Python. I hear Tetris is a > good starting point, and although I am fairly new to programming I > think I would learn best if I had some code to experiment with because > without a tutorial I have no idea where to start. If you know of a > tutorial that is specific to this game please let me know where to find > it. There's a 600-liners here: http://www.pygame.org/projects/21/133/ Not a tutorial, but maybe just as good? -- http://mail.python.org/mailman/listinfo/python-list
Re: Date Subtraction
In <[EMAIL PROTECTED]>, Cameron Laird wrote:
> In article <[EMAIL PROTECTED]>,
> Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote:
>>In <[EMAIL PROTECTED]>,
>>rsutradhar_python wrote:
>>> date1="2006-01-10"
>>> date2="2005-12-15"
>>> date = date1 - date2
>>> should give me 25 but problem is that date1 and date2 datatype is
>>> string which need to be conerted into date fromat which i am not able
>>> to do so please help me.
>>
>>from datetime import date
>>
>>date_str_1 = '2006-01-10'
>>date_str_2 = '2005-12-15'
>>date_1 = date(*map(int, date_str_1.split('-')))
>>date_2 = date(*map(int, date_str_2.split('-')))
>>print (date_1 - date_2).days - 1
> .
> .
> .
> Apparently you understand the original poster better than I.
> What's with the "- 1"? If I read you correctly, you'd calculate
> that there are zero days between, for example,
> 2006-01-13
> and
> 2006-01-12
> Do I have that right?
No that's not what I would calculate. I would do without the ``- 1`` but
the OP wanted 25 as result. Without the substraction it's 26. ;-)
Ciao,
Marc 'BlackJack' Rintsch
--
http://mail.python.org/mailman/listinfo/python-list
Tetris
I've been searching google and this group for a while now for a good tutorial on making a Tetris-style game in Python. I hear Tetris is a good starting point, and although I am fairly new to programming I think I would learn best if I had some code to experiment with because without a tutorial I have no idea where to start. If you know of a tutorial that is specific to this game please let me know where to find it. -- http://mail.python.org/mailman/listinfo/python-list
Re: maximum integer length?
nate wrote: > Hey everyone, > > I am trying to figure out what is the largest integer I can. Lets say > for 400 megabytes of memory at my disposal. > > I have tried a few things > c = 2**100 > d = 2**200 > print c**d > > Obviously I didn't have enough memory for that, but I was able to c**3. > (I think anyways, it is still trying to display the result) Don't print, takes too long. Do e=c**3. > > So I am just wondering how long an integer can be with 400 megabytes of > memory. > > I guess this is a question of logic? > each integer takes up a byte right? If I have 400 megabytes that would > mean I could have a long integer with up to 419,430,400,000 integers? > > Really I am not sure on this one and that is why I am asking. Because it > is just bugging me I am not sure how it works... > > I know this probably seems trivial and just a stupid question, but I > find this type of stuff interesting... Using gmpy (and I don't know if it stores large ints different from Python ints) and only 192M on my laptop, I can get to billion bit numbers, but not much larger. Switching to Python ints ran out of memory trying gen 11. It also ran out of memory trying to calculate gen 10, which gmpy was able to do successfully, so maybe gmpy is better for such things: Closed form: Type12MH(k,i) Find ith, kth Generation Type [1,2] Mersenne Hailstone using the closed form equation 2**(6*((i-1)*9**(k-1)+(9**(k-1)-1)/2+1)-1)-1 2**5-1 generation: 1 2**29-1 generation: 2 2**245-1 generation: 3 2**2189-1 generation: 4 2**19685-1 generation: 5 2**177149-1 generation: 6 2**1594325-1 generation: 7 2**14348909-1 generation: 8 2**129140165-1 generation: 9 2**1162261469-1 generation:10 Traceback (most recent call last): File "C:\python24\user\user_home\gmpy ver 1.01\MHtest.py", line 41, in -toplevel- a = Type12MH(k,1) File "C:\python24\lib\collatz_functions.py", line 595, in Type12MH return TWO**(SIX*a - ONE) - ONE ValueError: mpz.pow outrageous exponent >>> >>> i=1 >>> k=11 >>> a = 2**(6*((i-1)*9**(k-1)+(9**(k-1)-1)/2+1)-1)-1 Traceback (most recent call last): File "", line 1, in -toplevel- a = 2**(6*((i-1)*9**(k-1)+(9**(k-1)-1)/2+1)-1)-1 MemoryError -- http://mail.python.org/mailman/listinfo/python-list
Re: Date Subtraction
In article <[EMAIL PROTECTED]>,
Marc 'BlackJack' Rintsch <[EMAIL PROTECTED]> wrote:
>In <[EMAIL PROTECTED]>,
>rsutradhar_python wrote:
>
>> How to subtract date which is stored in string variable?
>>
>> Example:
>>
>> date1="2006-01-10"
>> date2="2005-12-15"
>> date = date1 - date2
>> should give me 25 but problem is that date1 and date2 datatype is
>> string which need to be conerted into date fromat which i am not able
>> to do so please help me.
>
>from datetime import date
>
>date_str_1 = '2006-01-10'
>date_str_2 = '2005-12-15'
>date_1 = date(*map(int, date_str_1.split('-')))
>date_2 = date(*map(int, date_str_2.split('-')))
>print (date_1 - date_2).days - 1
.
.
.
Apparently you understand the original poster better than I.
What's with the "- 1"? If I read you correctly, you'd calculate
that there are zero days between, for example,
2006-01-13
and
2006-01-12
Do I have that right?
--
http://mail.python.org/mailman/listinfo/python-list
Re: Extracting values from text file
Thus spoke Preben Randhol (on 2006-06-18 13:34):
> On Sun, 18 Jun 2006 10:54:01 +0200
> Mirco Wahab <[EMAIL PROTECTED]> wrote:
>> - no DWIM-ism (do what I mean) on 'value' addition
>
> But you don't add two values. you add two strings. If you
> want numbers you must convert the strings.
Why? At least - if its obvious, what I want.
> Yes, but how can Python know that you want to add to
> numbers and not concate two strings?
The programming language should make some
rules regarding its operators and their
meaning.
Compare:
# want to add NUMBERS ('1' + '1.'/1. = 2.)
#
# in python in perl
#
a1 = int( '1' ) $a1 = '1';
a1 += float( '1.' )$a1 += '1.';
print a1 print $a1;
a2 = int( '1' ) $a2 = '1';
a2 += 1. $a2 += 1.;
print a2 print $a2;
# want to add strings ('1' . '1.'/1. = 11.)
#
b1 = '1' $b1 = '1';
b1 += '1.';$b1 .= '1.';
print b1 print $b1;
b2 = '1' $b2 = '1';
b2 += str( 1. )$b2 .= 1.;
print b2 print $b2;
You see the picture? Pythons designer made the
same mistake as the Java/Javascript designer -
they use the _same_ operator (+) for number _addition_
and string _concatenation_, which is, imho, cumbersome.
If you have an operator with meaning "add numbers" (+)
and one for "add strings" (.), the language could then
do the obvious for you.
Why would one go from C/C++ to "dynamical typed"
things, if he has to be so explicit on easy
things?
Of course, you will get along with it, you
'learn' the corresponding 'python-phrases'
that do specific things, you get used to it.
But if you come, like me, from elsewhere,
there is sometimes something to rant on ;-)
I really try to get into it (Python), but
I'm, in such cases, more or less shocked -
and try express that , but I'm not interested
in 'language supremacy' discussions and the like.
BTW.: what exactly did you try to solve?
What would be a 'complete example' where
the parser has to chew on?
Regards
Mirco
--
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Re: maximum integer length?
On 2006-06-18, Sybren Stuvel <[EMAIL PROTECTED]> wrote: > nate enlightened us with: >> Obviously I didn't have enough memory for that, but I was able to c**3. >> (I think anyways, it is still trying to display the result) >> >> So I am just wondering how long an integer can be with 400 megabytes of >> memory. > > I guess the best way would be a binary search for the proper value of > the integer. You already have an upper (c**d) and a lower (c**3) bound > for your search. > >> each integer takes up a byte right? > > That depends on the size of the integer, doesn't it? > >> If I have 400 megabytes that would mean I could have a long integer >> with up to 419,430,400,000 integers? > > Que? An integer is just a whole number without fraction. What are you > talking about? He's talking about decimal digits. Each decimal digit takes up 3.322 bits. A byte can hold about 2.4 digits. 400MB should be able to hold an integer with about 1,010,000,000 decimal digits. -- Grant Edwards [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
debugging in eclipse+pydev
Hi. I'd like to know how to debug in eclipse+pydev. In the menu, "Pydev Debug", there's Start Debug Server option, but I don't know how to use it. Few questions I have about debugging are: 1) how do i set a breakpoints in pydev? 2) how do i execute the code line by line? I mean... step into, step over, and so on... When I searched on http://www.fabioz.com/pydev/, I found that Run/Debug Step Into F5 Debugging Run/Debug Step Over F6 Debugging Run/Debug Step Return F7 Debugging Run/Debug Resume F8 Debugging However, Starting Debug Server and pressing F5, F6, F7 didn't do those functions. Can anyone give me a small tutorial as to how to debug in Eclipse + Pydev please? Thanks in advance. -- http://mail.python.org/mailman/listinfo/python-list
Re: Detecting key presses
[EMAIL PROTECTED] schrieb: > Ok, I'm pretty new to python, so this might be a stupid question. I'm > trying to write a simple text-based pong clone, and I can't figure out > how to read key presses to move the paddles. I just need something that > does the same thing as getch() and kbhit(). I can't use those because > their windows only, and I'm running Linux. > > Someone suggested using curses, but that does crazy things with my > output, and leaves the terminal unusable after the program closes. Maybe using pygame for a graphical version is appealing to you - additionally, the event-sytem of it will do what you ask for. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping None values to ''
[EMAIL PROTECTED] wrote:
> hi
> i wish to map None or "None" values to "".
> eg
> a = None
> b = None
> c = "None"
>
> map( , [i for i in [a,b,c] if i in ("None",None) ])
>
> I can't seem to find a way to put all values to "". Can anyone help?
> thanks
a = [None, 'None', None]
def filtre(x):
if x is None or x == 'None':
return ''
else:
return x
assert map(filtre, a) == ['', '', '']
a = [1, 2, None, 'None', 3, 4]
assert map(filtre, a) == [1, 2, '', '', 3, 4]
--
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Re: maximum integer length?
nate wrote: > So I am just wondering how long an integer can be with 400 megabytes of > memory. > > I guess this is a question of logic? > each integer takes up a byte right? If I have 400 megabytes that would > mean I could have a long integer with up to 419,430,400,000 integers? > Python longs are stored using 15 bits out of every 16 bits (2 bytes). So every 2 bytes will contain approximately 4.5154 decimal digits. Ignoring memory usage and overhead, the number of digits in the largest possible long integer that can fit in 400 megabytes is >>> import math >>> 200 * 1024 * 1024 * 15 * math.log10(2) 946958486.2000643 Since memory space is required for temporary storage of intermediate results, you won't actually be able to create a number that large if you only have 400 megabytes. casevh -- http://mail.python.org/mailman/listinfo/python-list
Re: mapping None values to ''
[EMAIL PROTECTED] ha scritto:
> hi
> i wish to map None or "None" values to "".
> eg
> a = None
> b = None
> c = "None"
>
> map( , [i for i in [a,b,c] if i in ("None",None) ])
>
> I can't seem to find a way to put all values to "". Can anyone help?
> thanks
>
You already filtered [a,b,c] in the comprehension list, so you just have
to map all its values to "":
map(lambda x:"" , [i for i in [a,b,c] if i in ("None",None) ])
--
http://mail.python.org/mailman/listinfo/python-list
Re: mapping None values to ''
> i wish to map None or "None" values to "".
> eg
> a = None
> b = None
> c = "None"
>
> map( , [i for i in [a,b,c] if i in ("None",None) ])
>
> I can't seem to find a way to put all values to "". Can anyone help?
> thanks
I'd consider this a VeryBadIdea(tm). However, given Python's
introspective superpowers, it *can* be done (even if it most
likely *shouldn't* be done). That caveat out of the way, here goes:
>>> for scope in [locals, globals]:
... s = scope()
... for vbl, value in s.items():
... if value == None or (type(value) == type("") and
value == 'None'):
... s[vbl] = ''
seems to do the trick. You may, likely, just want to operate on
locals, not every last global variable in your project, in which
case you can just use
s = locals()
for vbl, value in s.items():
...
There may be some better way to determing whether an item is a
string than my off-the-cufff
type(value) == type("")
but it worked to prevent trying to compare non-strings to the
string 'None' later in the sub-clause of the if statement.
Note that if you wrap this in a function, you'll may have to pass
in locals() as a parameter because otherwise, inside your
function, you'll have a different set of available locals that
you did when you called the function. :)
Beware your foot when shooting this gun...it likes to aim at feet.
-tkc
--
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Re: Cycles between package imports
Martin Blais wrote: > Hi > > I'm a tad confused over a problem involving cycles between > packages. [lengthy example snipped] > > > I don't see why the reference to module a.alice could not be > available via the "from" syntax, even if it is still incompletely > initialized at the time of import. > > Can anyone shed some light onto this? Is there a rule for > determining when a module becomes available to import from a > package using the "from" syntax? It's really easy to see if you trace out, in detail, the exact order in which things happen and when each object is initialized and shows up in the respective module's namespace. The general rule is: don't do that. It doesn't work, and the hoops you have to go through to force it to work are so complex and bizzare that they're not worth it. Redesign the modules so you don't have cyclic dependencies. John Roth -- http://mail.python.org/mailman/listinfo/python-list
Re: Which compiler will Python 2.5 / Windows (Intel) be built with?
Scott David Daniels schreef: > I musunderstood you. I thought you were advocating that Python itself > be built on gcc, obviating many compiler access issues. That wouldn't > work because gcc cannot, by itself (as I understand it) get to all the > nooks and crannies a windows developer may need to traverse. I know I > just repeated my argument here against a strawman, but that was really > for other readers, not for you. I'm not actively advocating it since I realize I don't know enough about all the pros and cons, but yes, I would like for Python and other open source projects to use gcc even on Windows. It gives me an uneasy feeling when you can't use the source (apart from just reading it) of open source projects without depending on the whims of a third party. As an example, look what happened to the Linux kernel and Bitkeeper. One might argue that Microsoft is not really a third party since the whole Windows platform is made by them, but the problems are the same: as far as I understand, Visual Studio Express 2003 is no longer available, and the 2005 version is not binary compatible. In my case, I'm even unable to uninstall any modern Microsoft compiler since AFAICT they all require XP SP2 and I'm stuck with SP1 on my laptop since SP2 conflicts with the touchpad driver resulting in Windows blocking on booting, but that only effects me (I hope) and is something for a whole other rant. -- If I have been able to see further, it was only because I stood on the shoulders of giants. -- Isaac Newton Roel Schroeven -- http://mail.python.org/mailman/listinfo/python-list
mapping None values to ''
hi
i wish to map None or "None" values to "".
eg
a = None
b = None
c = "None"
map( , [i for i in [a,b,c] if i in ("None",None) ])
I can't seem to find a way to put all values to "". Can anyone help?
thanks
--
http://mail.python.org/mailman/listinfo/python-list
Re: Extracting values from text file
On Sun, 18 Jun 2006 10:54:01 +0200 Mirco Wahab <[EMAIL PROTECTED]> wrote: > > For the other issue I stumbled upon: > > - no DWIM-ism (do what I mean) on 'value' addition > > a = '1' > a += '1.' > print a > > will print > 11. > > and not 2., as in 'dynamically typed', 'operator based' languages. > (maybe the lack of a simple string-concatenation operator is the > reason?) But you don't add two values. you add two strings. If you want numbers you must convert the strings. > How could one approach these things without needing to > get too explicitly about 'type conversions' > (Python is supposed to be 'dynamically typed'?). Yes, but how can Python know that you want to add to numbers and not concate two strings? -- http://mail.python.org/mailman/listinfo/python-list
maximum integer length?
Hey everyone, I am trying to figure out what is the largest integer I can. Lets say for 400 megabytes of memory at my disposal. I have tried a few things c = 2**100 d = 2**200 print c**d Obviously I didn't have enough memory for that, but I was able to c**3. (I think anyways, it is still trying to display the result) So I am just wondering how long an integer can be with 400 megabytes of memory. I guess this is a question of logic? each integer takes up a byte right? If I have 400 megabytes that would mean I could have a long integer with up to 419,430,400,000 integers? Really I am not sure on this one and that is why I am asking. Because it is just bugging me I am not sure how it works... I know this probably seems trivial and just a stupid question, but I find this type of stuff interesting... -- http://mail.python.org/mailman/listinfo/python-list
Re: code is data
Ravi Teja wrote: > BJörn Lindqvist wrote: > > > Personally, I would like to see macros in Python (actually Logix > > > succeeding is good enough). But I am no language designer and the > > > community has no interest in it. When I absolutely need macros, I will > > > go elsewhere. > > > > One must wonder, when is that? When do you absolutely need macros? > > Whenever there is significant boiler plate code that functions and > classes cannot eliminate alone. > Whenever there is a more elegant way to express your code. > Me, I am torn. I should now better. I have listened to the arguments against Macros in Python and the ones that struck home were the argument for maintainability: Without macros, Python is Python. Statements do what you expect. And the argument against DSLs altogether: Make Python your DSL! If you design your own DSL before long you start to embellish it with more statements or datatypes and before long it becomes complex. If you used Python from the beginning then you would have a community for support. I know the arguments, but every once in a while I think if only I could craft my own ??? statement or Don't go their Paddy. ;-) -- http://mail.python.org/mailman/listinfo/python-list
python texts?
Everyone that took their time to reply, thank you. I have a better idea of where to go after Learning Python. I still do not have a good idea of where this book will put me in the grand scheme of things, but oh well. I suppose that is something I will find out soon enough. Once again, thank you for your responses --Nate. -- http://mail.python.org/mailman/listinfo/python-list
Re: Standard Yes / No Windows Dialog box creation
Ravi Teja a écrit : > > Assuming you are on MS Windows. > import win32api, win32con > win32api.MessageBox(0, "Question", "Title", win32con.MB_YESNO) Yes, that's exactly what I was looking for! Thanks!! -- http://mail.python.org/mailman/listinfo/python-list
Re: Standard Yes / No Windows Dialog box creation
SuperHik a écrit : > I've never seen "easier" way to do it, but my solution for you if you > want to create a GUI application without learning any GUI programming > would be to consider Glade, wxGlade and such... Yes I wanted something easy because it's the first time that I use a Gui into Python and I don't wanted to learn the complete Windows GUI programming just to display a Yes / No dialog box... > >> > > Do it just the same way as you did it with the "Open File" or "Open > > Folder" windows dialog. What is your problem with it? > > > I think what he means by "create" is somethink like > win32ui.CreateFileDialog() because of the "easier" part. Yes I wanted something like win32ui.CreateFileDialog() to create my dialog box. Unfortunately, win32ui.CreateDialog() is not so easy... -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting values from text file
Thus spoke Dennis Lee Bieber (on 2006-06-18 06:29): > On Sun, 18 Jun 2006 03:12:23 +0200, Mirco Wahab > <[EMAIL PROTECTED]> declaimed the following in comp.lang.python: >> - you have to explicitly instantiate a dictionary value >> (with 0) if/before you want in-place add to it (why is that?) > Uhm... Not quite... > ... > dict.get(key, default) > > returns the value associated by key, IFF key exists in the > dictionary, otherwise it returns the value defined for default. Thanks, Dennis, for your help on this part I bragged about. Now the extractor loop, according to your suggestion, can be written shorter: for rule in filter: k = re.search(r'\((.+)\)', rule) # pull out variable names ->k if k.group(1): # pull their values from text varname[k.group(1)] = varname.get(k.group(1), 0) + float( \ re.search( re.sub(r'\((.+)\)', varscanner, rule), \ example ).group(1) ) # use regex in modified 'rule' For the other issue I stumbled upon: - no DWIM-ism (do what I mean) on 'value' addition a = '1' a += '1.' print a will print 11. and not 2., as in 'dynamically typed', 'operator based' languages. (maybe the lack of a simple string-concatenation operator is the reason?) whereas: a = '1' a += 1. print a will fail magnificently. These thing would come handy when working with text/table driven computations (as above) How could one approach these things without needing to get too explicitly about 'type conversions' (Python is supposed to be 'dynamically typed'?). Regards & thanks Mirco -- http://mail.python.org/mailman/listinfo/python-list
Active Python versions
Why is the Windows msi install file for ActivePython-2.4.3.12 only 15MB whereas the older msi file for ActivePython-2.4.2.10 was 19MB? BTW, is that the prefered Python environment? -- Reply in group, but if emailing add another zero, and remove the last word. -- http://mail.python.org/mailman/listinfo/python-list
Re: Which compiler will Python 2.5 / Windows (Intel) be built with?
Scott David Daniels wrote: > I musunderstood you. I thought you were advocating that Python itself > be built on gcc, obviating many compiler access issues. That wouldn't > work because gcc cannot, by itself (as I understand it) get to all the > nooks and crannies a windows developer may need to traverse. I know I > just repeated my argument here against a strawman, but that was really > for other readers, not for you. Even that is incorrect. Python 2.x can be built fully with gcc. It's PythonWin that includes a lot of C++ and MFC code that won't compile with gcc. That doesn't preclude to use gcc for Python 2.x compilation, as long as a msvcrt is selected that can work together with some version of MFC and the MS C++ RTL. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
