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

stdlib/multiprocessing/process.pyi

@@ -1,5 +1,5 @@
 import sys
-from typing import Any, Callable, List, Mapping, Optional, Tuple
+from typing import Any, Callable, List, Mapping, Tuple
 
 class BaseProcess:
     name: str
@@ -8,12 +8,12 @@ class BaseProcess:
     def __init__(
         self,
         group: None = ...,
-        target: Optional[Callable[..., Any]] = ...,
-        name: Optional[str] = ...,
+        target: Callable[..., Any] | None = ...,
+        name: str | None = ...,
         args: Tuple[Any, ...] = ...,
         kwargs: Mapping[str, Any] = ...,
         *,
-        daemon: Optional[bool] = ...,
+        daemon: bool | None = ...,
     ) -> None: ...
     def run(self) -> None: ...
     def start(self) -> None: ...
@@ -21,14 +21,14 @@ class BaseProcess:
     if sys.version_info >= (3, 7):
         def kill(self) -> None: ...
         def close(self) -> None: ...
-    def join(self, timeout: Optional[float] = ...) -> None: ...
+    def join(self, timeout: float | None = ...) -> None: ...
     def is_alive(self) -> bool: ...
     @property
-    def exitcode(self) -> Optional[int]: ...
+    def exitcode(self) -> int | None: ...
     @property
-    def ident(self) -> Optional[int]: ...
+    def ident(self) -> int | None: ...
     @property
-    def pid(self) -> Optional[int]: ...
+    def pid(self) -> int | None: ...
     @property
     def sentinel(self) -> int: ...
 
@@ -36,4 +36,4 @@ def current_process() -> BaseProcess: ...
 def active_children() -> List[BaseProcess]: ...
 
 if sys.version_info >= (3, 8):
-    def parent_process() -> Optional[BaseProcess]: ...
+    def parent_process() -> BaseProcess | None: ...