ENH: set __module__ on IndexSlice

Author: dkane01

pandas/core/indexing.py

@@ -28,7 +28,10 @@
     LossySetitemError,
 )
 from pandas.errors.cow import _chained_assignment_msg
-from pandas.util._decorators import doc
+from pandas.util._decorators import (
+    doc,
+    set_module,
+)
 
 from pandas.core.dtypes.cast import (
     can_hold_element,
@@ -101,6 +104,7 @@
 
 
 # the public IndexSlicerMaker
+@set_module("pandas")
 class _IndexSlice:
     """
     Create an object to more easily perform multi-index slicing.

pandas/tests/api/test_api.py

@@ -457,5 +457,6 @@ def test_set_module():
     assert pd.to_timedelta.__module__ == "pandas"
     assert pd.to_numeric.__module__ == "pandas"
     assert pd.NamedAgg.__module__ == "pandas"
+    assert pd.IndexSlice.__module__ == "pandas"
     assert api.typing.SeriesGroupBy.__module__ == "pandas.api.typing"
     assert api.typing.DataFrameGroupBy.__module__ == "pandas.api.typing"