Added __class_getitem__ (#4695)

Resolves #4682

Co-authored-by: hauntsaninja <>

stdlib/3/asyncio/futures.pyi

@@ -11,6 +11,9 @@ if sys.version_info < (3, 8):
 if sys.version_info >= (3, 7):
     from contextvars import Context
 
+if sys.version_info >= (3, 9):
+    from types import GenericAlias
+
 _T = TypeVar("_T")
 _S = TypeVar("_S")
 
@@ -58,5 +61,7 @@ class Future(Awaitable[_T], Iterable[_T]):
     def __await__(self) -> Generator[Any, None, _T]: ...
     @property
     def _loop(self) -> AbstractEventLoop: ...
+    if sys.version_info >= (3, 9):
+        def __class_getitem__(cls, item: Any) -> GenericAlias: ...
 
 def wrap_future(future: Union[_ConcurrentFuture[_T], Future[_T]], *, loop: Optional[AbstractEventLoop] = ...) -> Future[_T]: ...

stdlib/3/asyncio/queues.pyi

@@ -1,5 +1,9 @@
+import sys
 from asyncio.events import AbstractEventLoop
-from typing import Generic, Optional, TypeVar
+from typing import Any, Generic, Optional, TypeVar
+
+if sys.version_info >= (3, 9):
+    from types import GenericAlias
 
 class QueueEmpty(Exception): ...
 class QueueFull(Exception): ...
@@ -25,6 +29,8 @@ class Queue(Generic[_T]):
     def get_nowait(self) -> _T: ...
     async def join(self) -> bool: ...
     def task_done(self) -> None: ...
+    if sys.version_info >= (3, 9):
+        def __class_getitem__(cls, type: Any) -> GenericAlias: ...
 
 class PriorityQueue(Queue[_T]): ...
 class LifoQueue(Queue[_T]): ...

stdlib/3/asyncio/tasks.pyi

@@ -22,6 +22,9 @@ from typing_extensions import Literal
 from .events import AbstractEventLoop
 from .futures import Future
 
+if sys.version_info >= (3, 9):
+    from types import GenericAlias
+
 _T = TypeVar("_T")
 _T1 = TypeVar("_T1")
 _T2 = TypeVar("_T2")
@@ -189,6 +192,8 @@ class Task(Future[_T], Generic[_T]):
         def all_tasks(cls, loop: Optional[AbstractEventLoop] = ...) -> Set[Task[Any]]: ...
     if sys.version_info < (3, 7):
         def _wakeup(self, fut: Future[Any]) -> None: ...
+    if sys.version_info >= (3, 9):
+        def __class_getitem__(cls, item: Any) -> GenericAlias: ...
 
 if sys.version_info >= (3, 7):
     def all_tasks(loop: Optional[AbstractEventLoop] = ...) -> Set[Task[Any]]: ...