> import os, sys > pyfile = (sys.platform[:3] == 'win' and 'python.exe') or 'python' > > Okay, run on a win32 machine, pyfile evaluates to python.exe [snip] > Now. Run this on linux. The first condition evaluates sys.platform[:3] > == 'win' as false. [snip] > Where am I going wrong. And when will this statment make pyfile > evaluate to 'python' ?
Your reasoning is correct. I'm guessing you're typing something wrong? Or typing the right thing in the wrong window (so that the command is run on a Windows box)? Or perhaps you're running on some weird build of Python? It does indeed work on my Debian box: [EMAIL PROTECTED]:~$ uname -a Linux rubbish 2.6.22-2-686 #1 SMP Fri Aug 31 00:24:01 UTC 2007 i686 GNU/Linux [EMAIL PROTECTED]:~$ python Python 2.4.4 (#2, Jan 3 2008, 13:36:28) [GCC 4.2.3 20071123 (prerelease) (Debian 4.2.2-4)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> sys.platform 'linux2' >>> sys.platform[:3]=="win" and "python.exe" or "python" 'python' >>> (sys.platform[:3]=="win" and "python.exe") or "python" 'python' Whereas on my Windows machine: c:\> python Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> sys.platform 'win32' >>> sys.platform[:3] == "win" and "python.exe" or "python" 'python.exe' That's both with and without the parens. Same happens in assignments. -tkc -- http://mail.python.org/mailman/listinfo/python-list
