gh-92871: Remove typing.{io,re} namespaces (#92873)

Closes #92871

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Lib/typing.py

@@ -16,7 +16,6 @@ At large scale, the structure of the module is following:
   no_type_check_decorator.
 * Generic aliases for collections.abc ABCs and few additional protocols.
 * Special types: NewType, NamedTuple, TypedDict.
-* Wrapper submodules for re and io related types.
 """
 
 from abc import abstractmethod, ABCMeta
@@ -27,7 +26,7 @@ import copyreg
 import contextlib
 import functools
 import operator
-import re as stdlib_re  # Avoid confusion with the re we export.
+import re as stdlib_re  # Avoid confusion with the typing.re namespace on <=3.11
 import sys
 import types
 import warnings
@@ -158,10 +157,6 @@ __all__ = [
     'Unpack',
 ]
 
-# The pseudo-submodules 're' and 'io' are part of the public
-# namespace, but excluded from __all__ because they might stomp on
-# legitimate imports of those modules.
-
 
 def _type_convert(arg, module=None, *, allow_special_forms=False):
     """For converting None to type(None), and strings to ForwardRef."""
@@ -3150,45 +3145,9 @@ class TextIO(IO[str]):
         pass
 
 
-class _DeprecatedType(type):
-    def __getattribute__(cls, name):
-        if name not in ("__dict__", "__module__") and name in cls.__dict__:
-            warnings.warn(
-                f"{cls.__name__} is deprecated, import directly "
-                f"from typing instead. {cls.__name__} will be removed "
-                "in Python 3.12.",
-                DeprecationWarning,
-                stacklevel=2,
-            )
-        return super().__getattribute__(name)
-
-
-class io(metaclass=_DeprecatedType):
-    """Wrapper namespace for IO generic classes."""
-
-    __all__ = ['IO', 'TextIO', 'BinaryIO']
-    IO = IO
-    TextIO = TextIO
-    BinaryIO = BinaryIO
-
-
-io.__name__ = __name__ + '.io'
-sys.modules[io.__name__] = io
-
 Pattern = _alias(stdlib_re.Pattern, 1)
 Match = _alias(stdlib_re.Match, 1)
 
-class re(metaclass=_DeprecatedType):
-    """Wrapper namespace for re type aliases."""
-
-    __all__ = ['Pattern', 'Match']
-    Pattern = Pattern
-    Match = Match
-
-
-re.__name__ = __name__ + '.re'
-sys.modules[re.__name__] = re
-
 
 def reveal_type[T](obj: T, /) -> T:
     """Reveal the inferred type of a variable.