🌐 Mailman 3 June 2002 - Python-list - python.org

Efficient python programming...
by Shagshag13 July 4, 2002

July 4, 2002

I'm looking for any state of art, optimizing techniques, tips, that a python beginner couldn't know by itself, but should learn and would be aware to write "efficient and good looking"python's code... (not the kind of thing which made you an obfuscated python nerd, but that "map" should be preferred to "for in loop" if possible, that dictionary are very well optimized, etc.) Thanks, s13.

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I'm an idiot
by David July 4, 2002

July 4, 2002

OK, I am the first to admit it. I am an idiot. I have RTFM on this over and over, and I can still not figure out what I am doing wrong. I think the intent of the code is obvious, but just to clarify, I want to read every line in a file and write those lines back out to another file, but with leading and training space removed. I also want to have some elegant way to determine that I have reached the end of the file and break out of the loop. And just to explain my stupidity, my reference langauge is BASIC. I could have written this in BASIC in a minute, but I need to learn something new. Any help would be appreciated. David f=open('c:\\temp\\temp.txt', 'r') g=open('c:\\temp\\temp1.txt', 'w') while 1: try: s=f.readline g.write(s.split()) except IOError: break g.close f.close

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Compilation error - no module named os
by Michal Cernoevic July 3, 2002

July 3, 2002

Excuse my question, but I am unable to compile Python 2.2.1 on Linux 2.4.9-31. I only did tar, cd Python-2.2.1; ./configure; make and the compilation finished so: *-s*) CC='gcc' LDSHARED='gcc -shared' OPT='-DNDEBUG -g -O3 -Wall -Wstrict-prototypes' ./python -E ./setup.py -q build;; \ *) CC='gcc' LDSHARED='gcc -shared' OPT='-DNDEBUG -g -O3 -Wall -Wstrict-prototypes' ./python -E ./setup.py build;; \ esac Could not find platform independent libraries <prefix> Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>] 'import site' failed; use -v for traceback Traceback (most recent call last): File "./setup.py", line 6, in ? import sys, os, getopt ImportError: No module named os make: *** [sharedmods] Error 1 Thanks for some ideas. With regards Michal Cernoevic

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A problem with urllib
by akineko＠pacbell.net July 3, 2002

July 3, 2002

Hi, I have noticed this problem for a while. Using FancyURLopener, you can provide user, passwd to authenticate a page in your program. (You need to override prompt_user_passwd() function) This feature works fine for most cases. However, when I tried to read my DSL router's Status page which required an authentication, it failed. The DSL router's default authentication is: user "" <<<-- empty string passwd "admin" urllib doesn't like user to be an empty string. Thus, it keeps asking a new user, passwd input (another call to prompt_user_passwd() ). And eventually it went crazy (recursive error?). Although providing an empty string to user input is a rare situation, I would like to read the DSL router's Status page to get the WAN address. BTW, you can change the passwd but can not specify the user in my DSL router. >From my Web browser, the following works just fine. http://:admin@192.168.1.1/Status.htm Any workaround? Thanks in advance. Best regards, Aki Niimura

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metaclasses vs. inheritance
by Ian McMeans July 3, 2002

July 3, 2002

Can someone give an example of a problem that is solved with metaclasses, which would be difficult or impossible to solve with inheritance? I (very barely) understand metaclasses, but to me it just seems like inheritance, where the classes who get the benefit of the meta-class get the metaclass' features. PS - what's the antonym of meta?

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Variable Interpolation - status of PEP 215
by Ganesan R July 2, 2002

July 2, 2002

Hi, I am a relative newbie to Python. I have a reasonably good perl background (don't worry I am not about to start a language flame war :-), and one of the things I really miss is variable interpolation in strings. I searched the net and found PEP 215 (http://www.python.org/peps/pep-0215.html). This seems to be exactly what I need. The proposal seems to be quite old, so I'd like to know if it's still in consideration or has it been dropped completely? Ganesan -- Ganesan R

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Preforked server in Python
by rayed July 2, 2002

July 2, 2002

Hi, I am looking for module similar to SocketServer that prefork chlidren instead of forking on each request. Thanks in advance - rayed

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converting an array of chars to a string
by JB July 2, 2002

July 2, 2002

How can I convert an array of chars to string? The problem is this: I should like to perform 8 bit calculations in a buffer. After this has been done, the buffer has to ba written to a binary file (and file.write takes strings instead of lists). -- Janos Blazi -----------== Posted via Newsfeed.Com - Uncensored Usenet News ==---------- http://www.newsfeed.com The #1 Newsgroup Service in the World! -----= Over 100,000 Newsgroups - Unlimited Fast Downloads - 19 Servers =-----

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Re: I'd give up Perl tomorrow if only...
by Frank Tobin July 2, 2002

July 2, 2002

Christopher A. Craig, on 2002-06-21, wrote: > Given the hardware and bandwidth, it shouldn't be all that hard to > create a CPAN for Python. I suspect one of the main reasons it hasn't > been done is that Google works so well. I don't think you have a good grasp of what CPAN really is. It's much more than simply a big FTP site. The key thing about CPAN is not only the breadth of modules it has, but the strong testing system they employ, namely cpan-testers. I am the author of a module on CPAN, and it's great to be able to upload module, and have it tested on a diverse set of architecures. http://testers.cpan.org/ Note that in order to have something be as successful as cpan-testers, modules needs to have: 1) a standard extraction mechanism (Perl and Python do have) 2) a standard testing mechanism (Perl has ('make test'), Python doesn't) 3) a standard installation mechanism (Perl and Python do have) 4) a standard README system (Perl has, Python doesn't) What is most missing for Python is a standard testing suite system. And until it gets this, it's pretty much not possible to get anything close to the quality of CPAN with cpan-testers. Another great benefit of CPAN is that the modules on it are somewhat 'sanctioned'. Sure, it doesn't take much to get onto CPAN, but the difference between the 'something' it does take, and 'nothing', is enormous in speaking for the quality of the modules you'll find in contrast to searching Google and coming across Joe Schmoe's Python module. A similar scenario is comparing random RPM's you might find on Google to FreeBSD/Gentoo's ports trees; the centralization somewhat sanctions the software, and this is critical, IMO. Furthermore, I find the de-facto multi-tier naming system that Perl employs for modules to be a good thing; it encourages users dividing up their modules in the global namespace. This is critical for finding what you need. For example, I can go into the DBD branch on CPAN and find every database driver it has. Python doesn't have an equivalent (packages just aren't the same thing; they are owned by 'one' thing, most of the time). -- Frank Tobin http://www.neverending.org/~ftobin/

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Python COM installation and NT Administrative rights.
by padhia＠yahoo.com July 1, 2002

July 1, 2002

Hi, I'd like to install Python COM on my work PC - on which I don't have administrative rights. Is there a Python COM installation available that does not require administrative rights on NT ? (I don't know if administrative rights is must for Python COM to install/work; but I have installed some other softwares that detect current privilege levels and install regitry entries reserved for per user instead of system. I am hoping that Python COM can be made to do something similar.) TIA P. Adhia

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