passing unicode to some of the stdlib functions produces incorrect mypy error in python 2.7

[manu-chroma]

This issue highlights few incorrect stubs in Python 2 stdlib stub files. Most of these are related to passing unicode string to stdlib functions which work correctly at runtime, but mypy shows unsupported type. (because stub files have mentioned str as the only allowed type)
List of the errors

• The docs mention that for urlunsplit function, The parts argument can be any five-item iterable.
  relevant docs link: https://docs.python.org/2/library/urlparse.html#urlparse.urlunsplit
  current stubs for the function: https://github.com/python/typeshed/blob/master/stdlib/2/urlparse.pyi#L58
  There might be other functions in the urlparse which might have similar bug.

• passing unicode string in open() builtin and as key to a dict.
  test.py

from __future__ import unicode_literals
from typing import Any, Text

def hello(name, **kwargs):
    # type: (Text, **Any) -> None
    with open(name, 'w') as r:
        pass

    b = kwargs.get('foo', 'nil')

hello("wow", foo="bar")

output

 ~  mypy --py2 test.py                                                                                                        
test.py:6: error: No overload variant of "open" matches argument types [builtins.unicode, builtins.unicode]
test.py:9: error: No overload variant of "get" of "Mapping" matches argument types [builtins.unicode, builtins.unicode]

Updated issue to include other found errors

[emmatyping]

As mentioned on gitter, the taker of this should also look at whether this method takes unicode

[manu-chroma]

In my code, I pass Tuple[str, str, str, str, unicode] for parts argument and it seems to work correctly.

[JelleZijlstra]

I'm about to submit PRs to fix two of the issues you mentioned.

I'm not sure your third issue (using unicode keys for a **kwargs dict) can be fixed in typeshed. The hack proposed in python/mypy#3619 will probably fix it though.

[JelleZijlstra]

See also python/mypy#1954.

[JelleZijlstra]

Both of the functions mentioned are fixed.

[mehdigmira]

same issue for:

• attrgetter() function of operator library
• CDLL() function of ctypes