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Allow non-yielding functions in tornado.gen.coroutine's type hint #2909

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merged 4 commits into from
Sep 13, 2020
Merged

Allow non-yielding functions in tornado.gen.coroutine's type hint #2909

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b30a947
Allow non-yielding functions in `tornado.gen.coroutine`'s type hint
Jackenmen Sep 10, 2020
805887d
Wrong union
Jackenmen Sep 10, 2020
e23aaea
Use overload to fix mypy's type inference
Jackenmen Sep 10, 2020
5eb2184
whoops...
Jackenmen Sep 10, 2020
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14 changes: 13 additions & 1 deletion tornado/gen.py
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Original file line number Diff line number Diff line change
Expand Up @@ -91,7 +91,7 @@ def get(self):
from tornado.util import TimeoutError

import typing
from typing import Union, Any, Callable, List, Type, Tuple, Awaitable, Dict
from typing import Union, Any, Callable, List, Type, Tuple, Awaitable, Dict, overload

if typing.TYPE_CHECKING:
from typing import Sequence, Deque, Optional, Set, Iterable # noqa: F401
Expand Down Expand Up @@ -153,8 +153,20 @@ def _create_future() -> Future:
return future


@overload
def coroutine(
func: Callable[..., "Generator[Any, Any, _T]"]
) -> Callable[..., "Future[_T]"]:
...


@overload
def coroutine(func: Callable[..., _T]) -> Callable[..., "Future[_T]"]:
...


def coroutine(
func: Union[Callable[..., "Generator[Any, Any, _T]"], Callable[..., _T]]
) -> Callable[..., "Future[_T]"]:
"""Decorator for asynchronous generators.

Expand Down