re match objects fail validation when using string as argument to group

[posita]

This is probably a special case of #1141, but this usage is explicitly documented in the standard library. From the docs for re match objects for both version 2 and version 3 (emphasis added):

If the regular expression uses the (?P<name>...) syntax, the groupN arguments may also be strings identifying groups by their group name.

# re_match_group.py
from __future__ import print_function
import re
m = re.search(r'^(?P<foo>bar)$', u'bar')
ms = m.group(u'foo')
print(ms)

Result fails in 2 …

$ mypy --version
mypy 0.501
$ python2.7 re_match_group.py
bar
$ mypy -2 re_match_group.py
re_match_group.py:5: error: No overload variant of "group" of "Match" matches argument types [builtins.unicode]

… and 3 …

$ python3.6 re_match_group.py
bar
$ mypy re_match_group.py
re_match_group.py:5: error: No overload variant of "group" of "Match" matches argument types [builtins.unicode]

[gvanrossum]

Can you file that in typeshed instead?

[posita]

Ah! Sorry. I knew better. 😞 It's already filed: python/typeshed#273. Apologies!