[issue28734] argparse: successive parsing wipes out nargs=? values

[Wolfgang Maier]

Wolfgang Maier added the comment:

try this:
parser.add_argument('file', nargs='?', default = argparse.SUPPRESS)

I don't think this is a bug. The default for the default parameter is None so the behavior is consistent with the documentation.

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nosy: +wolma

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<http://bugs.python.org/issue28734>
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