Use PEP 604 syntax wherever possible (#7493)

stdlib/asyncio/base_events.pyi

@@ -8,7 +8,7 @@ from asyncio.tasks import Task
 from asyncio.transports import BaseTransport, ReadTransport, SubprocessTransport, WriteTransport
 from collections.abc import Iterable
 from socket import AddressFamily, SocketKind, _Address, _RetAddress, socket
-from typing import IO, Any, Awaitable, Callable, Coroutine, Generator, Sequence, TypeVar, Union, overload
+from typing import IO, Any, Awaitable, Callable, Coroutine, Generator, Sequence, TypeVar, overload
 from typing_extensions import Literal
 
 if sys.version_info >= (3, 7):
@@ -23,7 +23,7 @@ _ProtocolT = TypeVar("_ProtocolT", bound=BaseProtocol)
 _Context = dict[str, Any]
 _ExceptionHandler = Callable[[AbstractEventLoop, _Context], Any]
 _ProtocolFactory = Callable[[], BaseProtocol]
-_SSLContext = Union[bool, None, ssl.SSLContext]
+_SSLContext = bool | None | ssl.SSLContext
 
 class Server(AbstractServer):
     if sys.version_info >= (3, 7):

stdlib/asyncio/base_subprocess.pyi

@@ -1,10 +1,10 @@
 import subprocess
 from collections import deque
-from typing import IO, Any, Callable, Optional, Sequence, Union
+from typing import IO, Any, Callable, Sequence
 
 from . import events, futures, protocols, transports
 
-_File = Optional[Union[int, IO[Any]]]
+_File = int | IO[Any] | None
 
 class BaseSubprocessTransport(transports.SubprocessTransport):
 

stdlib/asyncio/events.pyi

@@ -3,7 +3,7 @@ import sys
 from _typeshed import FileDescriptorLike, Self
 from abc import ABCMeta, abstractmethod
 from socket import AddressFamily, SocketKind, _Address, _RetAddress, socket
-from typing import IO, Any, Awaitable, Callable, Coroutine, Generator, Sequence, TypeVar, Union, overload
+from typing import IO, Any, Awaitable, Callable, Coroutine, Generator, Sequence, TypeVar, overload
 from typing_extensions import Literal
 
 from .base_events import Server
@@ -78,7 +78,7 @@ _ProtocolT = TypeVar("_ProtocolT", bound=BaseProtocol)
 _Context = dict[str, Any]
 _ExceptionHandler = Callable[[AbstractEventLoop, _Context], Any]
 _ProtocolFactory = Callable[[], BaseProtocol]
-_SSLContext = Union[bool, None, ssl.SSLContext]
+_SSLContext = bool | None | ssl.SSLContext
 
 class Handle:
     _cancelled: bool

stdlib/asyncio/format_helpers.pyi

@@ -1,12 +1,12 @@
 import functools
 import traceback
 from types import FrameType, FunctionType
-from typing import Any, Iterable, Union, overload
+from typing import Any, Iterable, overload
 
 class _HasWrapper:
     __wrapper__: _HasWrapper | FunctionType
 
-_FuncType = Union[FunctionType, _HasWrapper, functools.partial[Any], functools.partialmethod[Any]]
+_FuncType = FunctionType | _HasWrapper | functools.partial[Any] | functools.partialmethod[Any]
 
 @overload
 def _get_function_source(func: _FuncType) -> tuple[str, int]: ...

stdlib/asyncio/streams.pyi

@@ -1,6 +1,6 @@
 import sys
 from _typeshed import Self, StrPath
-from typing import Any, AsyncIterator, Awaitable, Callable, Iterable, Optional
+from typing import Any, AsyncIterator, Awaitable, Callable, Iterable
 
 from . import events, protocols, transports
 from .base_events import Server
@@ -64,7 +64,7 @@ else:
             "start_unix_server",
         ]
 
-_ClientConnectedCallback = Callable[[StreamReader, StreamWriter], Optional[Awaitable[None]]]
+_ClientConnectedCallback = Callable[[StreamReader, StreamWriter], Awaitable[None] | None]
 
 if sys.version_info < (3, 8):
     class IncompleteReadError(EOFError):

stdlib/asyncio/subprocess.pyi

@@ -2,7 +2,7 @@ import subprocess
 import sys
 from _typeshed import StrOrBytesPath
 from asyncio import events, protocols, streams, transports
-from typing import IO, Any, Callable, Union
+from typing import IO, Any, Callable
 from typing_extensions import Literal
 
 if sys.version_info >= (3, 7):
@@ -13,7 +13,7 @@ else:
 if sys.version_info >= (3, 8):
     _ExecArg = StrOrBytesPath
 else:
-    _ExecArg = Union[str, bytes]
+    _ExecArg = str | bytes
 
 PIPE: int
 STDOUT: int

stdlib/asyncio/tasks.pyi

@@ -2,7 +2,7 @@ import concurrent.futures
 import sys
 from collections.abc import Awaitable, Generator, Iterable, Iterator
 from types import FrameType
-from typing import Any, Coroutine, Generic, Optional, TextIO, TypeVar, Union, overload
+from typing import Any, Coroutine, Generic, TextIO, TypeVar, overload
 from typing_extensions import Literal
 
 from .events import AbstractEventLoop
@@ -56,8 +56,8 @@ _T3 = TypeVar("_T3")
 _T4 = TypeVar("_T4")
 _T5 = TypeVar("_T5")
 _FT = TypeVar("_FT", bound=Future[Any])
-_FutureT = Union[Future[_T], Generator[Any, None, _T], Awaitable[_T]]
-_TaskYieldType = Optional[Future[object]]
+_FutureT = Future[_T] | Generator[Any, None, _T] | Awaitable[_T]
+_TaskYieldType = Future[object] | None
 
 FIRST_COMPLETED = concurrent.futures.FIRST_COMPLETED
 FIRST_EXCEPTION = concurrent.futures.FIRST_EXCEPTION

stdlib/asyncio/trsock.pyi

@@ -7,7 +7,7 @@ from typing import Any, BinaryIO, Iterable, NoReturn, Union, overload
 # These are based in socket, maybe move them out into _typeshed.pyi or such
 _Address = Union[tuple[Any, ...], str]
 _RetAddress = Any
-_WriteBuffer = Union[bytearray, memoryview]
+_WriteBuffer = bytearray | memoryview
 _CMSG = tuple[int, int, bytes]
 
 class TransportSocket: