paul j3 added the comment:
http://bugs.python.org/issue21666
raises the possibility of testing the 'help' parameter in the same way. By
adding (to _check_argument):
# check the 'help' string
try:
self._get_formatter()._expand_help(action)
except (ValueError, TypeError, KeyError) as e:
raise ArgumentError(action, 'badly formed help string')
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