Friday 6 June 2003 — This is more than 22 years old. Be careful.
A few weeks ago, Guido van Rossum wrote about Python main() functions in his weblog. There are good ideas in there, but I didn’t agree with them all. In particular, I thought this was odd:
def main(argv=None):
if argv is None:
argv = sys.argv
# etc...if __name__ == "__main__":
sys.exit(main())
To me, it is better to keep the sys.exit and the sys.argv in one place:
def main(argv):
# etc...if __name__ == "__main__":
sys.exit(main(sys.argv))
The weblog has an active comment system, with Guido responding thoughtfully. After I posted my thoughts, he agreed to “compromise” with me!
By the way: one trick I’ve used in main() functions: when converting numeric arguments from strings in argv, use eval(), not int(). That way, you can use any numeric calculations you want in your command line arguments.
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