[issue9444] argparse does not honor prefix_chars when adding default options

[Steven Bethard]

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

A doc patch would also be welcome, but I do think it's a bug that "ArgumentParser(prefix_chars='+')" throws an exception, and I think Ted's patch looks fine to me.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9444>
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