Wolfgang Maier added the comment:

@rhettinger: I do not quite understand this harsh reaction. Making argparse 
more responsive could, in fact, be quite a nice improvement. This is 
particularly true, I guess, if you want argument completion with a package like 
https://pypi.python.org/pypi/argcomplete.

You have a point that the patch probably tries to optimize too many things in 
too many places at once, but that could be amended rather easily.

The idea of delaying imports in argparse itself to when they are actually 
needed is a really good one and, for this module, it is also very reasonable 
that other places in the stdlib only import it when they are run as __main__.

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<http://bugs.python.org/issue30152>
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