Remove dependency on typing_extension

Author: mroeschke

environment.yml

@@ -122,5 +122,4 @@ dependencies:
   - pip:
       - adbc-driver-postgresql>=0.10.0
       - adbc-driver-sqlite>=0.8.0
-      - typing_extensions; python_version<"3.11"
       - tzdata>=2023.3

pandas/_libs/tslibs/dtypes.pyi

@@ -1,6 +1,5 @@
 from enum import Enum
-
-from pandas._typing import Self
+from typing import Self
 
 OFFSET_TO_PERIOD_FREQSTR: dict[str, str]
 

pandas/_typing.py

@@ -16,7 +16,6 @@
     tzinfo,
 )
 from os import PathLike
-import sys
 from typing import (
     TYPE_CHECKING,
     Any,
@@ -93,20 +92,10 @@
     from typing import TypeGuard  # pyright: ignore[reportUnusedImport]
 
     P = ParamSpec("P")
-
-    if sys.version_info >= (3, 11):
-        from typing import Self  # pyright: ignore[reportUnusedImport]
-        from typing import Unpack  # pyright: ignore[reportUnusedImport]
-    else:
-        from typing_extensions import Self  # pyright: ignore[reportUnusedImport]
-        from typing_extensions import Unpack  # pyright: ignore[reportUnusedImport]
-
 else:
     ParamSpec: Any = None
-    Self: Any = None
     TypeGuard: Any = None
     Concatenate: Any = None
-    Unpack: Any = None
 
 HashableT = TypeVar("HashableT", bound=Hashable)
 HashableT2 = TypeVar("HashableT2", bound=Hashable)

pandas/core/_numba/extensions.py

@@ -12,7 +12,7 @@
 
 from contextlib import contextmanager
 import operator
-from typing import TYPE_CHECKING
+from typing import Self
 
 import numba
 from numba import types
@@ -41,9 +41,6 @@
 from pandas.core.internals import SingleBlockManager
 from pandas.core.series import Series
 
-if TYPE_CHECKING:
-    from pandas._typing import Self
-
 
 # Helper function to hack around fact that Index casts numpy string dtype to object
 #

pandas/core/indexes/frozen.py

@@ -10,17 +10,14 @@
 from __future__ import annotations
 
 from typing import (
-    TYPE_CHECKING,
     NoReturn,
+    Self,
 )
 
 from pandas.core.base import PandasObject
 
 from pandas.io.formats.printing import pprint_thing
 
-if TYPE_CHECKING:
-    from pandas._typing import Self
-
 
 class FrozenList(PandasObject, list):
     """

pandas/io/parsers/readers.py

@@ -19,7 +19,9 @@
     Any,
     Generic,
     Literal,
+    Self,
     TypedDict,
+    Unpack,
     overload,
 )
 import warnings
@@ -89,9 +91,7 @@
         HashableT,
         IndexLabel,
         ReadCsvBuffer,
-        Self,
         StorageOptions,
-        Unpack,
         UsecolsArgType,
     )
 

requirements-dev.txt

@@ -85,5 +85,4 @@ jupyterlite-core
 jupyterlite-pyodide-kernel
 adbc-driver-postgresql>=0.10.0
 adbc-driver-sqlite>=0.8.0
-typing_extensions; python_version<"3.11"
 tzdata>=2023.3