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# example1.py def main(dsn): "Do something with the database" print(dsn) # ... if __name__ == '__main__': import sys n = len(sys.argv[1:]) if n == 0: sys.exit('usage: python %s dsn' % sys.argv[0]) elif n == 1: main(sys.argv[1]) else: sys.exit('Unrecognized arguments: %s' % ' '.join(sys.argv[2:]))