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

stdlib/imp.pyi

@@ -1,7 +1,7 @@
 import types
 from _typeshed import StrPath
 from os import PathLike
-from typing import IO, Any, List, Optional, Protocol, Tuple, TypeVar, Union
+from typing import IO, Any, List, Protocol, Tuple, TypeVar
 
 from _imp import (
     acquire_lock as acquire_lock,
@@ -31,7 +31,7 @@ IMP_HOOK: int
 def new_module(name: str) -> types.ModuleType: ...
 def get_magic() -> bytes: ...
 def get_tag() -> str: ...
-def cache_from_source(path: StrPath, debug_override: Optional[bool] = ...) -> str: ...
+def cache_from_source(path: StrPath, debug_override: bool | None = ...) -> str: ...
 def source_from_cache(path: StrPath) -> str: ...
 def get_suffixes() -> List[Tuple[str, str, int]]: ...
 
@@ -44,21 +44,21 @@ class NullImporter:
 class _FileLike(Protocol):
     closed: bool
     mode: str
-    def read(self) -> Union[str, bytes]: ...
+    def read(self) -> str | bytes: ...
     def close(self) -> Any: ...
     def __enter__(self) -> Any: ...
     def __exit__(self, *args: Any) -> Any: ...
 
 # PathLike doesn't work for the pathname argument here
-def load_source(name: str, pathname: str, file: Optional[_FileLike] = ...) -> types.ModuleType: ...
-def load_compiled(name: str, pathname: str, file: Optional[_FileLike] = ...) -> types.ModuleType: ...
+def load_source(name: str, pathname: str, file: _FileLike | None = ...) -> types.ModuleType: ...
+def load_compiled(name: str, pathname: str, file: _FileLike | None = ...) -> types.ModuleType: ...
 def load_package(name: str, path: StrPath) -> types.ModuleType: ...
-def load_module(name: str, file: Optional[_FileLike], filename: str, details: Tuple[str, str, int]) -> types.ModuleType: ...
+def load_module(name: str, file: _FileLike | None, filename: str, details: Tuple[str, str, int]) -> types.ModuleType: ...
 
 # IO[Any] is a TextIOWrapper if name is a .py file, and a FileIO otherwise.
 def find_module(
-    name: str, path: Union[None, List[str], List[PathLike[str]], List[StrPath]] = ...
+    name: str, path: None | List[str] | List[PathLike[str]] | List[StrPath] = ...
 ) -> Tuple[IO[Any], str, Tuple[str, str, int]]: ...
 def reload(module: types.ModuleType) -> types.ModuleType: ...
-def init_builtin(name: str) -> Optional[types.ModuleType]: ...
+def init_builtin(name: str) -> types.ModuleType | None: ...
 def load_dynamic(name: str, path: str, file: Any = ...) -> types.ModuleType: ...  # file argument is ignored