🌐 Mailman 3 September 2007 - Python-list - python.org

Bug with lists of pairs of lists and append()
by Gabriel Zachmann Oct. 1, 2007

Oct. 1, 2007

Well, could some kind soul please explain to me why the following trivial code is misbehaving? #!/usr/bin/python lst = [ 0, 1, 2 ] s = [] l = [ lst[0] ] r = lst[1:] while r: x = (l,r) print x s.append( x ) l.append( r.pop(0) ) print s The output I get is: ([0], [1, 2]) ([0, 1], [2]) [([0, 1, 2], []), ([0, 1, 2], [])] and the error is in the last line: the two pairs in the outer list are identical and they should be as the pairs on the first and the 2nd line, respectively! I think I'm going nuts -- for the life of me I don't see what's going on ... (I've been tracking down a bug in my larger python script, and the cause seems to boil down to the above snippet.) Thanks a lot in advance for any insights, etc. Best regards, Gabriel.

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Bug with lists of pairs of lists and append()
by Gabriel Zachmann Oct. 1, 2007

Oct. 1, 2007

Well, could some kind soul please explain to me why the following trivial code is misbehaving? #!/usr/bin/python s = [] l = [ 0 ] r = [0, 0] while r: x = (l,r) print x s.append( x ) l.append( r.pop(0) ) print s The output I get is: ([0], [0, 0]) ([0, 0], [0]) [([0, 0, 0], []), ([0, 0, 0], [])] and the error is in the last line: the two pairs in the outer list are identical and they should be equal to the pairs one the first and the 2nd line, respectively! Shouldn't they? I think I'm going nuts -- for the life of me I don't see what's going on ... Thanks a lot in advance for any insights, etc. Best regards, Gabriel.

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Balloon Taskbar Popup for Windows XP
by makko Oct. 1, 2007

Oct. 1, 2007

Greetings, I need to create a function that will produce a balloon popup in the taskbar when called. Whats the shortest and easiest way to do this? Thanks. regards, Makko

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An Editor that Skips to the End of a Def
by W. Watson Oct. 1, 2007

Oct. 1, 2007

Is there an editor that allows one to position to put the cursor and then by pushing some button goes to the end of the def? -- Wayne Watson (Nevada City, CA) Web Page: <speckledwithStars.net>

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Re: Command-line does work when scheduled
by Jim Oct. 1, 2007

Oct. 1, 2007

On Sep 29, 8:45 pm, "Gabriel Genellina" <gagsl-...(a)yahoo.com.ar> wrote: > En Sat, 29 Sep 2007 22:04:06 -0300, Jim <jscre...(a)compuserve.com> escribi?: > > >> If it works this way, maybe the .py file extension is not correctly > >> registered. > > > Yes, it works this way. > > How do I register the .py extension correctly? > > From a command line, type: > assoc .py > You should get: > .py=Python.File > If you get an error, or another thing like py_auto_file: > assoc .py=Python.File > > Then: > ftype Python.File > You should get: > Python.File=c:\path\to\python.exe "%1" %* > If you don't: > ftype Python.File=c:\path\to\python.exe "%1" %* > > The %* at the end is important: if you created the association by using > "Open with...", or selecting Python from the list of installed programs, > very likely the command says only "%1" - that is, the script being open, > but without any additional arguments. > > Better if you have administrative rights to do this tasks. > > -- > Gabriel Genellina I believe I get the correct results as follows: ============================================== Microsoft Windows XP [Version 5.1.2600] (C) Copyright 1985-2001 Microsoft Corp. J:\Jim Crerar\mypython\misc>assoc .py .py=Python.File J:\Jim Crerar\mypython\misc>ftype Python.File Python.File="E:\Python25\python.exe" "%1" %* J:\Jim Crerar\mypython\misc> =============================================== What else could be wrong? Thanks, Jim

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s.split() on multiple separators
by mrkafk＠gmail.com Oct. 1, 2007

Oct. 1, 2007

Hello everyone, OK, so I want to split a string c into words using several different separators from a list (dels). I can do this the following C-like way: >>> c=' abcde abc cba fdsa bcd '.split() >>> dels='ce ' >>> for j in dels: cp=[] for i in xrange(0,len(c)-1): cp.extend(c[i].split(j)) c=cp >>> c ['ab', 'd', '', 'ab', '', ''] But. Surely there is a more Pythonic way to do this? I cannot do this: >>> for i in dels: c=[x.split(i) for x in c] because x.split(i) is a list.

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[Python] Matrix convergence
by Zhengzheng Pan Sept. 30, 2007

Sept. 30, 2007

Hi all, I'm trying to check whether a (stochastic/transition) matrix converges, i.e. a function/method that will return True if the input matrix sequence shows convergence and False otherwise. The background is a Markov progress, so the special thing about the transition matrix is the values of elements in each row add up to be 1. Fail to find any relevant build-in methods in Python... Currently the standard theorem on convergence in Markov chain literature is involved with the properties of aperiodic and connectivity, which I'm not able to implement with Python either... Therefore I'm actually also looking for alternative conditions to check for convergence, and am willing to sacrifice a little bit of precision. If you have any ideas/suggestions on how to examine the convergence of a matrix in general or specifically about this kind of matrices, and are willing to share, that'd be really great. Thx! Zz

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Re: notify when process finishes (on unix)
by Dan Stromberg Sept. 30, 2007

Sept. 30, 2007

On Sun, 30 Sep 2007 11:54:38 -0700, Michael Bentley wrote: > On Sep 30, 2007, at 7:11 AM, bahoo wrote: >> I'd like to write a script that sends me an email when a unix (Linux) >> process ends running (or CPU drops below some threshold). Could anyone >> point me to the relevant functions, or show me an example? > > man at. http://stromberg.dnsalias.org/~strombrg/notify-when-up2.html

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ANN: Generating svn:externals by inspecting a repository - z3c.repoexternals
by Ross Patterson Sept. 30, 2007

Sept. 30, 2007

z3c.repoexternals recursively retrieves subversion directory listings from the url or path and matches directories against a previous set of svn:externals if provided then against regular expressions and generates qualifying svn:externals lines. The defaults generate a set of svn:externals for all the trunks in a repository and keeps them up to date with the repository as new trunks are added when the previous externals are provided thereafter. http://cheeseshop.python.org/pypi/z3c.repoexternals Ross

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Re: GUI for viewing/editing python data structures?
by timaranz＠gmail.com Sept. 30, 2007

Sept. 30, 2007

On Sep 27, 11:23 am, "Joshua J. Kugler" <jos...(a)eeinternet.com> wrote: > A while back, I seem to remember coming across a small program that could > view and edit python data structures via a nice expanding tree view. I'm > now in need of something like that (to verify data is imported correctly > into a shelve file) and having a GUI would be much simpler than trying to > wade through the output of str(d) or repr(d). > > I've tried googling with the obvious keywords (gui (view OR edit) python > data structures) but t didn't get me anywhere. > > Pointers? > > j > > -- > Joshua Kugler > Lead System Admin -- Senior Programmerhttp://www.eeinternet.com > PGP Key:http://pgp.mit.edu/ ID 0xDB26D7CE Try any of the good Python IDE's and use breakpoints and the watch window. I like wing IDE from wingware.com - they have a free version now.

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