pycharm - Python inspector ignores property return hint when using TypeVar - Stack Overflow

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from abc import ABC, abstractmethod
from typing import TypeVar

T = TypeVar('T', bound='Abs')


class A:
    val: int = 10


class Abs(ABC):
    @property
    @abstractmethod
    def a(self) -> A:
        ...


class MyClass(Abs):
    _a: A = A()

    @property
    def a(self) -> A:
        return self._a


def foo(obj: T):
    print(obj.a.val)

In this example the code inspector highlights obj.a.val with Unresolved attribute reference 'val' for class 'property'.

Is that me incorrectly using the TypeVar, or maybe the problem is with PyCharm inspector? Is it possible in the first place to infer that a has val for sure?

from abc import ABC, abstractmethod
from typing import TypeVar

T = TypeVar('T', bound='Abs')


class A:
    val: int = 10


class Abs(ABC):
    @property
    @abstractmethod
    def a(self) -> A:
        ...


class MyClass(Abs):
    _a: A = A()

    @property
    def a(self) -> A:
        return self._a


def foo(obj: T):
    print(obj.a.val)

In this example the code inspector highlights obj.a.val with Unresolved attribute reference 'val' for class 'property'.

Is that me incorrectly using the TypeVar, or maybe the problem is with PyCharm inspector? Is it possible in the first place to infer that a has val for sure?

• python
• pycharm
• python-typing

Share Improve this question Follow edited Jan 31 at 15:58 InSync 11.1k44 gold badges1818 silver badges5656 bronze badges asked Jan 31 at 11:46 Anton ZeleninAnton Zelenin 3311 silver badge55 bronze badges

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1 Answer 1

Sorted by: Reset to default 1

Your code is fine. The inspector is handling it wrong. mypy accepts your code without complaint, and your code behaves correctly at runtime too.

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