pytorch/caffe2/python/context.pyi

from typing import Optional, TypeVar, Type

T = TypeVar('T')

class Managed:
    @classmethod
    def current(cls: Type[T], value: Optional[T] = None, required: bool = True) -> T: ...

    def __call__(self, func: T) -> T: ...

    def __enter__(self: T) -> T: ...

class DefaultManaged(Managed): ...
caffe2: refactor context to allow being typed (#48340) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/48340 This changes the context managed classes from using a decorator to define them to using inheritance. Inheritance allows the python static type checking to work correctly. ``` context.define_context() class Bar(object): ... context.define_context(allow_default=True) class Foo(object): ... ``` becomes ``` class Foo(context.Managed): ... class Bar(context.DefaultManaged): ... ``` Behavior differences: * arg_name has been removed since it's not used anywhere * classes need to call `super()` in `__enter__/__exit__` methods if they override (none do) This also defines a context.pyi file to add types for python3. python2 support should not be affected Test Plan: ci buck test //caffe2/caffe2/python:context_test //caffe2/caffe2/python:checkpoint_test Reviewed By: dongyuzheng Differential Revision: D25133469 fbshipit-source-id: 16368bf723eeb6ce3308d6827f5ac5e955b4e29a 2020-12-01 02:29:04 +00:00			`from typing import Optional, TypeVar, Type`

			`T = TypeVar('T')`

			`class Managed:`
			`@classmethod`
			`def current(cls: Type[T], value: Optional[T] = None, required: bool = True) -> T: ...`

			`def __call__(self, func: T) -> T: ...`

			`def __enter__(self: T) -> T: ...`

			`class DefaultManaged(Managed): ...`