PEP 604: Remove some more uses of Union/Optional (#7515)

The following patterns still break mypy:

1. `type[]` at top level fails
2. `tuple[T1, T2]` at top level fails (but `tuple[T1, ...]` is fine)
3. `T1 | Callable[..., T2 | T3]` fails, but only <=3.9

This PR cleans up usage of `Union` and `Optional` outside these patterns.

stdlib/asyncio/trsock.pyi

@@ -2,10 +2,10 @@ import socket
 import sys
 from builtins import type as Type  # alias to avoid name clashes with property named "type"
 from types import TracebackType
-from typing import Any, BinaryIO, Iterable, NoReturn, Union, overload
+from typing import Any, BinaryIO, Iterable, NoReturn, overload
 
 # These are based in socket, maybe move them out into _typeshed.pyi or such
-_Address = Union[tuple[Any, ...], str]
+_Address = tuple[Any, ...] | str
 _RetAddress = Any
 _WriteBuffer = bytearray | memoryview
 _CMSG = tuple[int, int, bytes]

stdlib/os/__init__.pyi

@@ -32,7 +32,6 @@ from typing import (
     Protocol,
     Sequence,
     TypeVar,
-    Union,
     overload,
     runtime_checkable,
 )
@@ -832,16 +831,16 @@ def execlpe(file: StrOrBytesPath, __arg0: StrOrBytesPath, *args: Any) -> NoRetur
 # Not separating out PathLike[str] and PathLike[bytes] here because it doesn't make much difference
 # in practice, and doing so would explode the number of combinations in this already long union.
 # All these combinations are necessary due to list being invariant.
-_ExecVArgs = Union[
-    tuple[StrOrBytesPath, ...],
-    list[bytes],
-    list[str],
-    list[PathLike[Any]],
-    list[bytes | str],
-    list[bytes | PathLike[Any]],
-    list[str | PathLike[Any]],
-    list[bytes | str | PathLike[Any]],
-]
+_ExecVArgs = (
+    tuple[StrOrBytesPath, ...]
+    | list[bytes]
+    | list[str]
+    | list[PathLike[Any]]
+    | list[bytes | str]
+    | list[bytes | PathLike[Any]]
+    | list[str | PathLike[Any]]
+    | list[bytes | str | PathLike[Any]]
+)
 _ExecEnv = Mapping[bytes, bytes | str] | Mapping[str, bytes | str]
 
 def execv(__path: StrOrBytesPath, __argv: _ExecVArgs) -> NoReturn: ...

stdlib/traceback.pyi

@@ -1,7 +1,7 @@
 import sys
 from _typeshed import Self, SupportsWrite
 from types import FrameType, TracebackType
-from typing import IO, Any, Generator, Iterable, Iterator, Mapping, Optional, overload
+from typing import IO, Any, Generator, Iterable, Iterator, Mapping, overload
 from typing_extensions import Literal
 
 __all__ = [
@@ -26,7 +26,7 @@ __all__ = [
     "walk_tb",
 ]
 
-_PT = tuple[str, int, str, Optional[str]]
+_PT = tuple[str, int, str, str | None]
 
 def print_tb(tb: TracebackType | None, limit: int | None = ..., file: IO[str] | None = ...) -> None: ...
 

stdlib/wsgiref/handlers.pyi

@@ -1,6 +1,6 @@
 from abc import abstractmethod
 from types import TracebackType
-from typing import IO, Callable, MutableMapping, Optional
+from typing import IO, Callable, MutableMapping
 
 from .headers import Headers
 from .types import ErrorStream, InputStream, StartResponse, WSGIApplication, WSGIEnvironment
@@ -8,7 +8,7 @@ from .util import FileWrapper
 
 __all__ = ["BaseHandler", "SimpleHandler", "BaseCGIHandler", "CGIHandler", "IISCGIHandler", "read_environ"]
 
-_exc_info = tuple[Optional[type[BaseException]], Optional[BaseException], Optional[TracebackType]]
+_exc_info = tuple[type[BaseException] | None, BaseException | None, TracebackType | None]
 
 def format_date_time(timestamp: float | None) -> str: ...  # undocumented
 def read_environ() -> dict[str, str]: ...

stdlib/xmlrpc/client.pyi

@@ -13,8 +13,10 @@ class _SupportsTimeTuple(Protocol):
     def timetuple(self) -> time.struct_time: ...
 
 _DateTimeComparable = DateTime | datetime | str | _SupportsTimeTuple
-_Marshallable = Union[None, bool, int, float, str, bytes, tuple[Any, ...], list[Any], dict[Any, Any], datetime, DateTime, Binary]
-_XMLDate = Union[int, datetime, tuple[int, ...], time.struct_time]
+_Marshallable = (
+    bool | int | float | str | bytes | None | tuple[Any, ...] | list[Any] | dict[Any, Any] | datetime | DateTime | Binary
+)
+_XMLDate = int | datetime | tuple[int, ...] | time.struct_time
 _HostType = Union[tuple[str, dict[str, str]], str]
 
 def escape(s: str) -> str: ...  # undocumented