Terry J. Reedy added the comment: Demos should demonstrate proper modern code. 1. Contain decent docstrings. 2. Dependency on sys.argv, derived from a command line, should be in the 'if __name__' clause triggered when the module *is* invoked from command line. Especially in simple cases like this, it should be possible to import the module and call main(args) without involving sys.argv. See review.
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