Cannot determine consistent method resolution order (MRO) for "OrderedSet" when used with Python 2.7

Question

Cannot determine consistent method resolution order (MRO) for "OrderedSet" when used with Python 2.7

Closed this issue 6 years ago · 2 comments

I have installed those stubs for Python 2.7 and am manipulating mypy to find them, by running mypy as follows (~/v27 is a virtualenv):

mypy test.py --python-version 2.7 --python-executable~/v27/bin/python

This give me the error

/Users/guido/v27/lib/python2.7/site-packages/ordered_set-stubs/__init__.pyi:10: error: Cannot determine consistent method resolution order (MRO) for "OrderedSet"

When used with Python 3 all is well.

Answer 1 · 2018-11-14T05:09:02.000Z

Thank you for bug report, @gvanrossum!

Answer 2 · 2018-11-14T16:02:59.000Z

Actually it looks like this was a bug in typeshed -- we're fixing it (though you'll have to wait for the next mypy release to get the fix). See python/typeshed#2602.