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From: rh <richard_hubbe11@lavabit.com>
Subject: How does one make argparse print usage when no options are provided on the command line?
Date: Wed, 5 Dec 2012 08:48:30 -0800
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Xref: csiph.com comp.lang.python:34294

I have argparse working with one exception. I wanted the program to print out
usage when no command line options are given. But I only came across
other examples where people didn't use argparse but instead printed out
a separate usage statement. So they used argparse for everything but the
case where no command line args are given.