[issue8538] Add FlagAction to argparse

[Steven Bethard]

Steven Bethard <steven.bethard at gmail.com> added the comment:

On the off chance that someone was waiting for feedback from me, I'll say:

(1) A simple boolean --foo/--no-foo action seems useful to me. I would probably call it BooleanOptionalAction rather than FlagAction. (Almost anything could be considered a "flag".)

(2) At the moment, argparse doesn't supply any actions, so I don't think we should make a separate namespace for them. If it starts to grow a list of such actions, we can add a separate namespace later. (And given that the name will end with "Action", I think it should be pretty clear without the namespace.)

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<http://bugs.python.org/issue8538>
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