Posts Tagged ‘conventions’
import sys import getopt class Usage(Exception): def __init__(self, msg): self.msg = msg def main(argv=None): if argv is None: argv = sys.argv try: try: opts, args = getopt.getopt(argv[1:], "h", ["help"]) except getopt.error, msg: raise Usage(msg) # more code, unchanged except Usage, err: print >>sys.stderr, err.msg print >>sys.stderr, "for help use --help" return 2 if __name__ == "__main__": sys.exit(main())
What is this, you wonder? As it turns out, it’s Guido van Rossum’s preferred way to enter a Python program. It’s a sensible departure from the classic variant. Even though this post is from 2003, I am discovering for the first time; perhaps I will adopt this idiom in some of my programs since it has been blessed by the lord of Python.