Chris Jerdonek added the comment:
Note that we would also have to deal with not just the error text but also the
usage string. From the docs:
>>> parser.parse_args('11'.split())
usage: PROG [-h] {5,6,7,8,9}
PROG: error: argument foo: invalid choice: 11 (choose from 5, 6, 7, 8, 9)
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