[docs] [issue13540] Document the Action API in argparse

[Jason R. Coombs]

Jason R. Coombs <jaraco at jaraco.com> added the comment:

I've attached a repository and patch with the recommended changes. I created an additional section that includes the documentation for the Action class (specifically the __init__ and __call__ signatures).

I believe this addresses the issues I raised. Any objections to this change? I haven't tested the rendering yet, but I'll do that before pushing to the master if it's adequate.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13540>
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