Big diff: Use new "|" union syntax (#5872)

stdlib/asyncio/streams.pyi

@@ -1,6 +1,6 @@
 import sys
 from _typeshed import StrPath
-from typing import Any, AsyncIterator, Awaitable, Callable, Iterable, Optional, Tuple, Union
+from typing import Any, AsyncIterator, Awaitable, Callable, Iterable, Optional, Tuple
 
 from . import events, protocols, transports
 from .base_events import Server
@@ -9,30 +9,30 @@ _ClientConnectedCallback = Callable[[StreamReader, StreamWriter], Optional[Await
 
 if sys.version_info < (3, 8):
     class IncompleteReadError(EOFError):
-        expected: Optional[int]
+        expected: int | None
         partial: bytes
-        def __init__(self, partial: bytes, expected: Optional[int]) -> None: ...
+        def __init__(self, partial: bytes, expected: int | None) -> None: ...
     class LimitOverrunError(Exception):
         consumed: int
         def __init__(self, message: str, consumed: int) -> None: ...
 
 async def open_connection(
-    host: Optional[str] = ...,
-    port: Optional[Union[int, str]] = ...,
+    host: str | None = ...,
+    port: int | str | None = ...,
     *,
-    loop: Optional[events.AbstractEventLoop] = ...,
+    loop: events.AbstractEventLoop | None = ...,
     limit: int = ...,
-    ssl_handshake_timeout: Optional[float] = ...,
+    ssl_handshake_timeout: float | None = ...,
     **kwds: Any,
 ) -> Tuple[StreamReader, StreamWriter]: ...
 async def start_server(
     client_connected_cb: _ClientConnectedCallback,
-    host: Optional[str] = ...,
-    port: Optional[Union[int, str]] = ...,
+    host: str | None = ...,
+    port: int | str | None = ...,
     *,
-    loop: Optional[events.AbstractEventLoop] = ...,
+    loop: events.AbstractEventLoop | None = ...,
     limit: int = ...,
-    ssl_handshake_timeout: Optional[float] = ...,
+    ssl_handshake_timeout: float | None = ...,
     **kwds: Any,
 ) -> Server: ...
 
@@ -42,29 +42,29 @@ if sys.platform != "win32":
     else:
         _PathType = str
     async def open_unix_connection(
-        path: Optional[_PathType] = ..., *, loop: Optional[events.AbstractEventLoop] = ..., limit: int = ..., **kwds: Any
+        path: _PathType | None = ..., *, loop: events.AbstractEventLoop | None = ..., limit: int = ..., **kwds: Any
     ) -> Tuple[StreamReader, StreamWriter]: ...
     async def start_unix_server(
         client_connected_cb: _ClientConnectedCallback,
-        path: Optional[_PathType] = ...,
+        path: _PathType | None = ...,
         *,
-        loop: Optional[events.AbstractEventLoop] = ...,
+        loop: events.AbstractEventLoop | None = ...,
         limit: int = ...,
         **kwds: Any,
     ) -> Server: ...
 
 class FlowControlMixin(protocols.Protocol):
-    def __init__(self, loop: Optional[events.AbstractEventLoop] = ...) -> None: ...
+    def __init__(self, loop: events.AbstractEventLoop | None = ...) -> None: ...
 
 class StreamReaderProtocol(FlowControlMixin, protocols.Protocol):
     def __init__(
         self,
         stream_reader: StreamReader,
-        client_connected_cb: Optional[_ClientConnectedCallback] = ...,
-        loop: Optional[events.AbstractEventLoop] = ...,
+        client_connected_cb: _ClientConnectedCallback | None = ...,
+        loop: events.AbstractEventLoop | None = ...,
     ) -> None: ...
     def connection_made(self, transport: transports.BaseTransport) -> None: ...
-    def connection_lost(self, exc: Optional[Exception]) -> None: ...
+    def connection_lost(self, exc: Exception | None) -> None: ...
     def data_received(self, data: bytes) -> None: ...
     def eof_received(self) -> bool: ...
 
@@ -73,7 +73,7 @@ class StreamWriter:
         self,
         transport: transports.BaseTransport,
         protocol: protocols.BaseProtocol,
-        reader: Optional[StreamReader],
+        reader: StreamReader | None,
         loop: events.AbstractEventLoop,
     ) -> None: ...
     @property
@@ -90,7 +90,7 @@ class StreamWriter:
     async def drain(self) -> None: ...
 
 class StreamReader:
-    def __init__(self, limit: int = ..., loop: Optional[events.AbstractEventLoop] = ...) -> None: ...
+    def __init__(self, limit: int = ..., loop: events.AbstractEventLoop | None = ...) -> None: ...
     def exception(self) -> Exception: ...
     def set_exception(self, exc: Exception) -> None: ...
     def set_transport(self, transport: transports.BaseTransport) -> None: ...