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Programming Python, 3rd Edition
book

Programming Python, 3rd Edition

by Mark Lutz
August 2006
Intermediate to advanced content levelIntermediate to advanced
1600 pages
51h 46m
English
O'Reilly Media, Inc.
Content preview from Programming Python, 3rd Edition

A Portable Program-Launch Framework

With all of these different ways to start programs on different platforms, it can be difficult to remember what tools to use in a given situation. Moreover, some of these tools are called in ways that are complicated and thus easy to forget (for me, at least). I write scripts that need to launch Python programs often enough that I eventually wrote a module to try to hide most of the underlying details. While I was at it, I made this module smart enough to automatically pick a launch scheme based on the underlying platform. Laziness is the mother of many a useful module.

Example 5-25 collects in a single module many of the techniques we’ve met in this chapter. It implements an abstract superclass, LaunchMode, which defines what it means to start a Python program, but it doesn’t define how. Instead, its subclasses provide a run method that actually starts a Python program according to a given scheme, and (optionally) define an announce method to display a program’s name at startup time.

Example 5-25. PP3E\launchmodes.py

############################################################### # launch Python programs with reusable launcher scheme classes; # assumes 'python' is on your system path (but see Launcher.py) ############################################################### import sys, os pyfile = (sys.platform[:3] == 'win' and 'python.exe') or 'python' def findPythonExe( ): try: # get path to python pypath = sys.executable # use sys in newer pys except ...
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Publisher Resources

ISBN: 0596009259Supplemental ContentErrata Page