linting

Author: jorisvandenbossche

pandas/core/arrays/string_.py

@@ -86,7 +86,8 @@ class StringDtype(StorageExtensionDtype):
     ----------
     storage : {"python", "pyarrow"}, optional
         If not given, the value of ``pd.options.mode.string_storage``.
-    na_value :
+    na_value : {np.nan, pd.NA}, default pd.NA
+        Whether the dtype follows NaN or NA missing value semantics.
 
     Attributes
     ----------

pandas/core/arrays/string_arrow.py

@@ -131,7 +131,7 @@ class ArrowStringArray(ObjectStringArrayMixin, ArrowExtensionArray, BaseStringAr
     # base class "ArrowExtensionArray" defined the type as "ArrowDtype")
     _dtype: StringDtype  # type: ignore[assignment]
     _storage = "pyarrow"
-    _na_value = libmissing.NA
+    _na_value: libmissing.NAType | float = libmissing.NA
 
     def __init__(self, values) -> None:
         _chk_pyarrow_available()