Mercurial > cpython-lru_cache-weakref
diff Lib/argparse.py @ 68969:4bb651eb7539 2.7
Issue #9348: Raise an early error if argparse nargs and metavar don't match. (Merge from 3.2.)
| author | Steven Bethard <steven.bethard@gmail.com> |
|---|---|
| date | Sat, 26 Mar 2011 17:57:52 +0100 |
| parents | e82501812ae3 |
| children | 75ec20b4c50e |
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--- a/Lib/argparse.py Sat Mar 26 12:18:00 2011 +0000 +++ b/Lib/argparse.py Sat Mar 26 17:57:52 2011 +0100 @@ -1284,6 +1284,13 @@ if not _callable(type_func): raise ValueError('%r is not callable' % type_func) + # raise an error if the metavar does not match the type + if hasattr(self, "_get_formatter"): + try: + self._get_formatter()._format_args(action, None) + except TypeError: + raise ValueError("length of metavar tuple does not match nargs") + return self._add_action(action) def add_argument_group(self, *args, **kwargs):