How does one make argparse print usage when no options are provided on the command line?

From	rh <richard_hubbe11@lavabit.com>
Subject	How does one make argparse print usage when no options are provided on the command line?
Date	2012-12-05 08:48 -0800
Newsgroups	comp.lang.python
Message-ID	<mailman.501.1354726122.29569.python-list@python.org> (permalink)

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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.

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How does one make argparse print usage when no options are provided on the command line? rh <richard_hubbe11@lavabit.com> - 2012-12-05 08:48 -0800

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