CLN: reindex_axis remove unnecessary args, always copy=False (pandas-dev#41190)

Author: jbrockmendel

pandas/core/generic.py

@@ -246,14 +246,18 @@ def __init__(
 
     @classmethod
     def _init_mgr(
-        cls, mgr, axes, dtype: Dtype | None = None, copy: bool_t = False
+        cls,
+        mgr: Manager,
+        axes,
+        dtype: Dtype | None = None,
+        copy: bool_t = False,
     ) -> Manager:
         """ passed a manager and a axes dict """
         for a, axe in axes.items():
             if axe is not None:
                 axe = ensure_index(axe)
                 bm_axis = cls._get_block_manager_axis(a)
-                mgr = mgr.reindex_axis(axe, axis=bm_axis, copy=False)
+                mgr = mgr.reindex_axis(axe, axis=bm_axis)
 
         # make a copy if explicitly requested
         if copy:

pandas/core/indexing.py

@@ -701,7 +701,7 @@ def _ensure_listlike_indexer(self, key, axis=None, value=None):
             keys = self.obj.columns.union(key, sort=False)
 
             self.obj._mgr = self.obj._mgr.reindex_axis(
-                keys, axis=0, copy=False, consolidate=False, only_slice=True
+                keys, axis=0, consolidate=False, only_slice=True
             )
 
     def __setitem__(self, key, value):

pandas/core/internals/base.py

@@ -11,16 +11,14 @@
 from pandas._typing import (
     DtypeObj,
     Shape,
+    final,
 )
 from pandas.errors import AbstractMethodError
 
 from pandas.core.dtypes.cast import find_common_type
 
 from pandas.core.base import PandasObject
-from pandas.core.indexes.api import (
-    Index,
-    ensure_index,
-)
+from pandas.core.indexes.api import Index
 
 T = TypeVar("T", bound="DataManager")
 
@@ -59,31 +57,26 @@ def reindex_indexer(
     ) -> T:
         raise AbstractMethodError(self)
 
+    @final
     def reindex_axis(
-        self,
-        new_index,
+        self: T,
+        new_index: Index,
         axis: int,
-        method=None,
-        limit=None,
         fill_value=None,
-        copy: bool = True,
         consolidate: bool = True,
         only_slice: bool = False,
-    ):
+    ) -> T:
         """
         Conform data manager to new index.
         """
-        new_index = ensure_index(new_index)
-        new_index, indexer = self.axes[axis].reindex(
-            new_index, method=method, limit=limit
-        )
+        new_index, indexer = self.axes[axis].reindex(new_index)
 
         return self.reindex_indexer(
             new_index,
             indexer,
             axis=axis,
             fill_value=fill_value,
-            copy=copy,
+            copy=False,
             consolidate=consolidate,
             only_slice=only_slice,
         )