🌐 Mailman 3 February 2005 - Python-list - python.org

Newbie question
by Ryan White March 1, 2005

March 1, 2005

Hi all I'm wanting to use python to display some jpeg images, maybe present them at a percentage of their actual size etc. How do I display an image in Python? - I've run over Tkinter, but obviously in all the wrong places. Any help or sample code would be much appreciated. Ryan

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Re: string methods (warning, newbie)
by Steven Bethard March 1, 2005

March 1, 2005

Nick Coghlan wrote: > Jimmy Retzlaff wrote: > >> The approach you are considering may be easier than you think: >> >>>>> filter(str.isalpha, 'The Beatles - help - 03 - Ticket to ride') >> >> 'TheBeatleshelpTickettoride' > > Hmm, I think this is a case where filter is significantly clearer than > the equivalent list comprehension: > > Py> "".join([c for c in 'The Beatles - help - 03 - Ticket to ride' if > c.isalpha( > )]) > 'TheBeatleshelpTickettoride' On the other hand, filter doesn't do the same thing: py> s = u'The Beatles - help - 03 - Ticket to ride' py> filter(str.isalpha, s) Traceback (most recent call last): File "<interactive input>", line 1, in ? TypeError: descriptor 'isalpha' requires a 'str' object but received a 'unicode' py> ''.join(c for c in s if c.isalpha()) u'TheBeatleshelpTickettoride' Ideally, you could use something like basestring.isalpha and have it work for both str and unicode, but no such luck. =) STeVe

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Re: naming convention for scalars, lists, dictionaries ...
by Just March 1, 2005

March 1, 2005

In article <mailman.3152.1109622405.22381.python-list(a)python.org>, Jack Diederich <jack(a)performancedrivers.com> wrote: > On Mon, Feb 28, 2005 at 04:02:37PM -0500, Benji York wrote: > > Jack Diederich wrote: > > >Ditto for me, plural implies list and singular implies instance, > > >for (contact) in contacts: > > > # do something with contact > > > > May I ask why you place the parenthesis in the for statement? > > I like the tuple-ness feel of it and frequently unpack multiple > values in for loops. I also like the visual feel, it makes it > easy to see what is being unpacked and what is the source. > > "for (one, two, three) in somelist:" > versus > "for one, two, three in sometlist:" > > Even with a colorizing editor (emacs) I find the first version > easier to read. YMMV. But you're using it for _single_ values. That's like writing (val) = someFunction(...) Just

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Working with dbase files
by Stan Cook March 1, 2005

March 1, 2005

Does anyone know how I can access and read data from a dbase (.dbf) file? Regards, Stan

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Re: My C module crashes
by John Machin March 1, 2005

March 1, 2005

Egil Moeller wrote: > Hi! > > I've written a C-module for Python, and it works as intended, but > obviously does something wrong with its memmory management (refference > counting), as it causes Python to segfault now and then (randomly, > whey :S) > > The module source code is available at > http://grimoire.takeit.se/files/CReader.c > > The code isn't _that_ long, so someone experienced with writing Python C > modules should probably not have that hard a time finding what I do > wrong :) What you are doing wrong: 1. Unless getting the source to/from a web page has stuffed up the indentation [which you should have checked before posting your message], it appears to be indented only ONE space per level. Are you using tabs? Don't. They are intrinsically evil. 2. Your code's over 1200 lines long, and even after allowing for the indentation problem it certainly doesn't read like the poetry of your namesake, Skalla-Grim's son. 3. Expecting people to debug your code remotely when it exhibits problems (1) and (2) 4. Not stating what (if anything) you have tried yourself before posting. 5. Using system free() and realloc() instead the Python-supplied memory API functions. 6. Using *ANY* free() or realloc() function on memory that has *NOT* been allocated with the allocator function from the same family. 7. Not checking whether a buffer has even been allocated before trying to deallocate it.

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Re: Controlling Pc From Server?
by Larry Bates March 1, 2005

March 1, 2005

What you are asking IS much more difficult that just "timing". The Internet is a disconnected stateless medium. I can open a browser to a site and just leave my browser open. Am I viewing that site or not? There's no way to know. I might have minimized the browser window and am back doing productive work (assuming my access to the web was non-productive). The best way I've found to do what you want is to force all HTTP traffic through a proxy (I like Squid, but others work as well). The proxy cache logs can provide you with lost of information about where people are going and how much information they download from the site. They cannot however tell you how long someone was there because of what I mentioned above. You can see if someone is going to www.nascar.com or www.espn.com or to some other site. You can also block sites quite easily if there is no legitimate reason for people to be at that site. Hope info helps. Larry Bates andrea_gavana(a)tin.it wrote: > Hello Kartic & NG, > > Thank you for your prompt answer. In effect, I'm trying to work on > a NT network of 6 PC (plus the server). Sorry to not have been clearer. > Ideally, I'm trying to monitor the Internet activity of each client (PC) > on this network (but I'm not a boss trying to control my emplyees, I'm just > curious on it). I would like to know which PC is connected to Internet (by > starting something like a "timer" for every PC, and then periodically check > if a particular PC is connected or not). This should be done from the main > server. > Did I make myself clear? Do you think it would be a huge task? > > Sorry, it may be a very basic question, but thank you for your help. > > Andrea. > >

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module/import question
by subopt＠gmail.com March 1, 2005

March 1, 2005

I'm trying to import Logilab's constraint module like this: from logilab.constraint import * from within a Python interactive session. The module is not installed correctly on our system, and it won't be, so i adjusted my PYTHONPATH, added an empty __init__.py file, then started up an interactive session. When i do the above import i get: Traceback (most recent call last): File "<stdin>", line 1, in ? File "/afs/big/long/freakin/path/to/dl/__init__.py",line 23,in ? ImportError: No module named constraint.propagation the first time i do it, then the 2nd time it succeeds w/o a complaint. The adjustment to my PYTHONPATH var was to append : afs/big/long/freakin/path/to/dl to the previous value. Any idea what i'm doing wrong? thanks in advance, E

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My C module crashes
by Egil Moeller March 1, 2005

March 1, 2005

Hi! I've written a C-module for Python, and it works as intended, but obviously does something wrong with its memmory management (refference counting), as it causes Python to segfault now and then (randomly, whey :S) The module source code is available at http://grimoire.takeit.se/files/CReader.c The code isn't _that_ long, so someone experienced with writing Python C modules should probably not have that hard a time finding what I do wrong :) Thanks in advance, Egil Möller

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Newbie question: Uninstalling Python Package Manager packages
by Jeffrey A. Zelt March 1, 2005

March 1, 2005

I am new to python, but am very enthusiastic about the language and hope to start using it for serious work soon (after I am more comfortable with all the details). I have installed a package via the Python Package Manager program on Mac OS X 10.3 (http://www.python.org/packman/). My question is: How do I UNinstall the package? Is there somewhere I can find what has been installed and where it was installed so I can delete the file(s) manually? Or is there a simpler procedure to uninstall, similar to how the package manager performs the install? Nothing horrible has occurred yet, but I feel uncomfortable installing something when I don't know where the files will end up, nor how to uninstall it. Any help would be appreciated. Thanks in advance. Jeff ===================== Jeffrey A. Zelt jeff(a)wave.no http://www.jeff.wave.no/ =====================

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[ANN] PyAC 0.1.0
by Premshree Pillai March 1, 2005

March 1, 2005

PyAC 0.1.0 (http://sourceforge.net/projects/pyac/) * ignores non-image files * optional arg is_ppt for ordering presentation images (eg., Powerpoint files exported as images) * misc fixes Package here: http://sourceforge.net/project/showfiles.php?group_id=106998&package_id=115… -- Premshree Pillai http://www.livejournal.com/users/premshree/

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