[issue9355] argparse add_mutually_exclusive_group more than once has incorrectly formatted help

[Catherine Devlin]

Catherine Devlin <fredv8vibwc at liquidid.net> added the comment:

copy of Drake's argparse.diff - same patch, just has less specific diff header info (because ``patch -p0 < argparse.diff`` failed on my machine)

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Added file: http://bugs.python.org/file18393/mutually_exclusive_help.patch

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