paul j3 added the comment:
I'd suggest not worrying about the default metavar in the _expand_help()
method. The formatted choice string created in that method is only used if the
help line includes a '%(choices)s' string. The programmer can easily omit that
if he isn't happy with the expanded list.
TestHelpVariableExpansion is the only test in test_argparse.py that uses it.
Sig('--foo', choices=['a', 'b', 'c'],
help='foo %(prog)s %(default)s %(choices)s')
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<http://bugs.python.org/issue16468>
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