Add _typeshed.(Opt)ExcInfo (#7645)

stdlib/_typeshed/__init__.pyi

@@ -7,7 +7,8 @@ import ctypes
 import mmap
 import sys
 from os import PathLike
-from typing import AbstractSet, Any, Awaitable, Container, Generic, Iterable, Protocol, TypeVar
+from types import TracebackType
+from typing import AbstractSet, Any, Awaitable, Container, Generic, Iterable, Protocol, TypeVar, Union
 from typing_extensions import Final, Literal, TypeAlias, final
 
 _KT = TypeVar("_KT")
@@ -197,6 +198,9 @@ WriteableBuffer: TypeAlias = bytearray | memoryview | array.array[Any] | mmap.mm
 # Same as _WriteableBuffer, but also includes read-only buffer types (like bytes).
 ReadableBuffer: TypeAlias = ReadOnlyBuffer | WriteableBuffer  # stable
 
+ExcInfo: TypeAlias = tuple[type[BaseException], BaseException, TracebackType]
+OptExcInfo: TypeAlias = Union[ExcInfo, tuple[None, None, None]]
+
 # stable
 if sys.version_info >= (3, 10):
     from types import NoneType as NoneType

stdlib/_typeshed/wsgi.pyi

@@ -5,7 +5,7 @@
 # See the README.md file in this directory for more information.
 
 import sys
-from sys import _OptExcInfo
+from _typeshed import OptExcInfo
 from typing import Any, Callable, Iterable, Protocol
 from typing_extensions import TypeAlias
 
@@ -19,7 +19,7 @@ else:
     # stable
     class StartResponse(Protocol):
         def __call__(
-            self, __status: str, __headers: list[tuple[str, str]], __exc_info: _OptExcInfo | None = ...
+            self, __status: str, __headers: list[tuple[str, str]], __exc_info: OptExcInfo | None = ...
         ) -> Callable[[bytes], object]: ...
 
     WSGIEnvironment: TypeAlias = dict[str, Any]  # stable