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V on 01/31/07


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main recipe


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Python main() functions

Published in: Python 

URL: http://www.artima.com/weblogs/viewpost.jsp?thread=4829

Guido Van Rossum talks about his recipe for a useful main() function.

Plain TextExpand 
  1. import sys
  2. import getopt
  3.  
  4. class Usage(Exception):
  5.     def __init__(self, msg):
  6.         self.msg = msg
  7.  
  8. def main(argv=None):
  9.     if argv is None:
  10.         argv = sys.argv
  11.     try:
  12.         try:
  13.             opts, args = getopt.getopt(argv[1:], "h", ["help"])
  14.         except getopt.error, msg:
  15.              raise Usage(msg)
  16.         # more code, unchanged
  17.     except Usage, err:
  18.         print >>sys.stderr, err.msg
  19.         print >>sys.stderr, "for help use --help"
  20.         return 2
  21.  
  22. if __name__ == "__main__":
  23.     sys.exit(main())

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