REF: Remove internals.base (#57208)

Author: rhshadrach

pandas/core/frame.py

@@ -259,7 +259,7 @@
 
     from pandas.core.groupby.generic import DataFrameGroupBy
     from pandas.core.interchange.dataframe_protocol import DataFrame as DataFrameXchg
-    from pandas.core.internals import SingleDataManager
+    from pandas.core.internals.managers import SingleBlockManager
 
     from pandas.io.formats.style import Styler
 
@@ -4530,14 +4530,14 @@ def _ensure_valid_index(self, value) -> None:
 
             self._mgr = self._mgr.reindex_axis(index_copy, axis=1, fill_value=np.nan)
 
-    def _box_col_values(self, values: SingleDataManager, loc: int) -> Series:
+    def _box_col_values(self, values: SingleBlockManager, loc: int) -> Series:
         """
         Provide boxed values for a column.
         """
         # Lookup in columns so that if e.g. a str datetime was passed
         #  we attach the Timestamp object as the name.
         name = self.columns[loc]
-        # We get index=self.index bc values is a SingleDataManager
+        # We get index=self.index bc values is a SingleBlockManager
         obj = self._constructor_sliced_from_mgr(values, axes=values.axes)
         obj._name = name
         return obj.__finalize__(self)

pandas/core/internals/__init__.py

@@ -1,8 +1,4 @@
 from pandas.core.internals.api import make_block  # 2023-09-18 pyarrow uses this
-from pandas.core.internals.base import (
-    DataManager,
-    SingleDataManager,
-)
 from pandas.core.internals.concat import concatenate_managers
 from pandas.core.internals.managers import (
     BlockManager,
@@ -14,9 +10,7 @@
     "DatetimeTZBlock",  # pylint: disable=undefined-all-variable
     "ExtensionBlock",  # pylint: disable=undefined-all-variable
     "make_block",
-    "DataManager",
     "BlockManager",
-    "SingleDataManager",
     "SingleBlockManager",
     "concatenate_managers",
 ]