fixes based on PR review

Author: Dr-Irv

pandas/core/algorithms.py

@@ -1314,7 +1314,7 @@ def searchsorted(
 _diff_special = {"float64", "float32", "int64", "int32", "int16", "int8"}
 
 
-def diff(arr, n: int | float | np.integer, axis: AxisInt = 0):
+def diff(arr, n: int | float | np.integer | np.floating, axis: AxisInt = 0):
     """
     difference of n between self,
     analogous to s-s.shift(n)

pandas/core/arrays/masked.py

@@ -713,7 +713,7 @@ def _hasna(self) -> bool:
         # make this faster by having an optional mask, but not have to change
         # source code using it..
 
-        return cast(bool, self._mask.any())
+        return bool(self._mask.any())
 
     def _propagate_mask(
         self, mask: npt.NDArray[np.bool_] | None, other

pandas/io/parsers/readers.py

@@ -22,6 +22,7 @@
     Self,
     TypedDict,
     Unpack,
+    cast,
     overload,
 )
 import warnings
@@ -1818,7 +1819,7 @@ def _refine_defaults_read(
     return kwds
 
 
-def _extract_dialect(kwds: dict[str, Any]) -> csv.Dialect | None:
+def _extract_dialect(kwds: dict[str, str]) -> csv.Dialect | None:
     """
     Extract concrete csv dialect instance.
 
@@ -1831,11 +1832,14 @@ def _extract_dialect(kwds: dict[str, Any]) -> csv.Dialect | None:
 
     dialect = kwds["dialect"]
     if dialect in csv.list_dialects():
-        dialect = csv.get_dialect(dialect)
+        # get_dialect is typed to return a `_csv.Dialect` for some reason in typeshed
+        tdialect = cast(csv.Dialect, csv.get_dialect(dialect))
 
-    _validate_dialect(dialect)
+        _validate_dialect(tdialect)
+    else:
+        tdialect = None
 
-    return dialect  # pyright: ignore[reportReturnType]
+    return tdialect
 
 
 MANDATORY_DIALECT_ATTRS = (
@@ -1848,7 +1852,7 @@ def _extract_dialect(kwds: dict[str, Any]) -> csv.Dialect | None:
 )
 
 
-def _validate_dialect(dialect: csv.Dialect | Any) -> None:
+def _validate_dialect(dialect: csv.Dialect | str) -> None:
     """
     Validate csv dialect instance.
 

pandas/io/pytables.py

@@ -128,7 +128,6 @@
         AxisInt,
         DtypeArg,
         FilePath,
-        Shape,
         npt,
     )
 
@@ -3384,7 +3383,7 @@ class BlockManagerFixed(GenericFixed):
     nblocks: int
 
     @property
-    def shape(self) -> Shape | list[int] | None:
+    def shape(self) -> list[int] | None:
         try:
             ndim = self.ndim