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Any apparently not considered part of Union[Any, builtins.None] #3472
Description
When running mypy --strict against the following code:
from typing import Any, Optional
class Test(object):
def __init__(self) -> None:
self.attr = "foo" # type: Any
def foo(self, do_it: bool) -> Optional[Any]:
if do_it:
return self.attr
else:
return NoneI see the following warning:
testcase.py:11: warning: Returning Any from function with declared return type "Union[Any, builtins.None]"
This seems obviously incorrect. At the very least, it's a confusing error message.
Bisecting suggests that this behaviour was introduced in 4141d20.
Activity
gvanrossum commentedon May 30, 2017
That's @JukkaL's PR #3086.
ilevkivskyi commentedon May 30, 2017
I think the problem is not with Jukka's PR but in the logic of
--warn-return-any. It should not emit warning ifAnyis a proper subtype of the declared return type. I have an idea for a very simple fix, if it will work, then I will make a PR shortly.ilevkivskyi commentedon May 30, 2017
OK, here is the PR #3473
Don't warn about returning Any if it is a proper subtype of the retur…
OddBloke commentedon May 30, 2017
Thanks all! When might we expect to see this in a release?
JukkaL commentedon May 30, 2017
We typically have a release every 2 months or so, so the next release could be June/Julyish.