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Give self argument the correct type when using check_untyped_defs #7530

merged 4 commits into from Sep 19, 2019


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msullivan commented Sep 18, 2019

This is accomplished by updating the helper that constructs a callable type
from a func def to fill in the self argument.

This will make check_untyped_defs a lot more useful.

@msullivan msullivan requested review from JukkaL and ilevkivskyi Sep 18, 2019
@msullivan msullivan force-pushed the check-untyped-self branch from 43c2b66 to b1c3238 Sep 18, 2019
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ilevkivskyi left a comment

Thanks! Looks very good. Could you please add Fixes #... to the PR description for relevant issues? I believe these are:

def bar(cls):
cls.baz() # E: "Type[Foo]" has no attribute "baz"
[builtins fixtures/classmethod.pyi]

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ilevkivskyi Sep 19, 2019


I would add also tests for two other reported problems:

  • An attribute initialized with 0 in untyped __init__ has revealed type int in another untyped method
  • Descriptors also work as expected in untyped methods.

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JukkaL Sep 19, 2019


Also, if an attribute is initialized to None in __init__ the inferred type should probably be either Optional[Any] or Any (the first one may generate many false positives). If an attribute is initialized to [], the inferred type should probably be List[Any], and I think that we shouldn't require a type annotation.

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@msullivan msullivan merged commit 855076b into master Sep 19, 2019
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@msullivan msullivan deleted the check-untyped-self branch Sep 19, 2019

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The-Compiler commented Oct 22, 2019

As a data point: In my project I just introduced check_untyped_defs a week ago - after the upgrade to 0.740 I now see 469 new errors 😆

Thanks for this, though! I have some work ahead of me now, but it indeed seems to make mypy a lot more useful for codebases which aren't fully annotated yet.

facebook-github-bot added a commit to pytorch/pytorch that referenced this pull request Oct 27, 2019

`__iter__` methods are supposed to return iterators (, but some of them are typed to return iterables, which is too general. This results in error messages such as `Iterable[Module[Any]]" has no attribute "__next__"` from Mypy. Technically this should also have caused a type error [here](, but due to a bug in Mypy type checking isn't working correctly in untyped methods (this will be fixed in the next release though: python/mypy#7530).
Pull Request resolved: #27445

Reviewed By: lerks

Differential Revision: D18113966

Pulled By: fmassa

fbshipit-source-id: c6261ac866f86df4328e6d2fdfca0625aa2d2492
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