[issue9399] Provide a 'print' action for argparse

[Dennis Malcorps]

Dennis Malcorps <dennis.malcorps at googlemail.com> added the comment:

> parser.add_argument('--license', action='write', message='...', file=sys.stdout)
The ability to redirect the output would be a nice addition.

> parser.add_argument('--license', action='call', callable=lambda: sys.stdout.write(message)) 
optparse already has a 'callable' action, I had the impression it was left out of argparse on purpose, even tough I couldn't imagine why...

Either way is fine for me.

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<http://bugs.python.org/issue9399>
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