TYP: StorageExtensionDtype.na_values (#47300)

* TYP: StorageExtensionDtype.na_values

* flake8

Author: twoertwein

pandas/core/arrays/arrow/dtype.py

@@ -5,7 +5,6 @@
 import numpy as np
 import pyarrow as pa
 
-from pandas._libs import missing as libmissing
 from pandas._typing import DtypeObj
 from pandas.util._decorators import cache_readonly
 
@@ -22,7 +21,6 @@ class ArrowDtype(StorageExtensionDtype):
     Modeled after BaseMaskedDtype
     """
 
-    na_value = libmissing.NA
     _metadata = ("storage", "pyarrow_dtype")  # type: ignore[assignment]
 
     def __init__(self, pyarrow_dtype: pa.DataType) -> None:

pandas/core/dtypes/base.py

@@ -395,7 +395,6 @@ class StorageExtensionDtype(ExtensionDtype):
     """ExtensionDtype that may be backed by more than one implementation."""
 
     name: str
-    na_value = libmissing.NA
     _metadata = ("storage",)
 
     def __init__(self, storage=None) -> None:
@@ -416,6 +415,10 @@ def __hash__(self) -> int:
         # custom __eq__ so have to override __hash__
         return super().__hash__()
 
+    @property
+    def na_value(self) -> libmissing.NAType:
+        return libmissing.NA
+
 
 def register_extension_dtype(cls: type_t[ExtensionDtypeT]) -> type_t[ExtensionDtypeT]:
     """

pyright_reportGeneralTypeIssues.json

@@ -39,7 +39,6 @@
         "pandas/core/computation/align.py",
         "pandas/core/construction.py",
         "pandas/core/describe.py",
-        "pandas/core/dtypes/base.py",
         "pandas/core/dtypes/cast.py",
         "pandas/core/dtypes/common.py",
         "pandas/core/dtypes/concat.py",