REF: Move BaseIndexers and indexer.py functions into their own directory

pandas/api/indexers/__init__.py

@@ -3,7 +3,7 @@
 """
 
 from pandas.core.indexers import check_array_indexer
-from pandas.core.window.indexers import (
+from pandas.core.indexers.objects import (
     BaseIndexer,
     FixedForwardWindowIndexer,
     VariableOffsetWindowIndexer,

pandas/core/generic.py

@@ -164,9 +164,9 @@
     from pandas._libs.tslibs import BaseOffset
 
     from pandas.core.frame import DataFrame
+    from pandas.core.indexers.objects import BaseIndexer
     from pandas.core.resample import Resampler
     from pandas.core.series import Series
-    from pandas.core.window.indexers import BaseIndexer
 
 # goal is to be able to define the docs close to function, while still being
 # able to share

pandas/core/indexers/__init__.py

@@ -0,0 +1,31 @@
+from pandas.core.indexers.utils import (
+    check_array_indexer,
+    check_key_length,
+    check_setitem_lengths,
+    deprecate_ndim_indexing,
+    is_empty_indexer,
+    is_exact_shape_match,
+    is_list_like_indexer,
+    is_scalar_indexer,
+    is_valid_positional_slice,
+    length_of_indexer,
+    maybe_convert_indices,
+    unpack_1tuple,
+    validate_indices,
+)
+
+__all__ = [
+    "is_valid_positional_slice",
+    "is_list_like_indexer",
+    "is_scalar_indexer",
+    "is_empty_indexer",
+    "check_setitem_lengths",
+    "validate_indices",
+    "maybe_convert_indices",
+    "is_exact_shape_match",
+    "length_of_indexer",
+    "deprecate_ndim_indexing",
+    "unpack_1tuple",
+    "check_key_length",
+    "check_array_indexer",
+]

pandas/core/window/ewm.py

@@ -26,6 +26,11 @@
 from pandas.core.dtypes.missing import isna
 
 import pandas.core.common as common  # noqa: PDF018
+from pandas.core.indexers.objects import (
+    BaseIndexer,
+    ExponentialMovingWindowIndexer,
+    GroupbyIndexer,
+)
 from pandas.core.util.numba_ import maybe_use_numba
 from pandas.core.window.common import zsqrt
 from pandas.core.window.doc import (
@@ -39,11 +44,6 @@
     template_see_also,
     window_agg_numba_parameters,
 )
-from pandas.core.window.indexers import (
-    BaseIndexer,
-    ExponentialMovingWindowIndexer,
-    GroupbyIndexer,
-)
 from pandas.core.window.numba_ import (
     generate_ewma_numba_table_func,
     generate_numba_ewma_func,

pandas/core/window/expanding.py

@@ -18,6 +18,11 @@
 from pandas.compat.numpy import function as nv
 from pandas.util._decorators import doc
 
+from pandas.core.indexers.objects import (
+    BaseIndexer,
+    ExpandingIndexer,
+    GroupbyIndexer,
+)
 from pandas.core.window.doc import (
     _shared_docs,
     args_compat,
@@ -30,11 +35,6 @@
     window_agg_numba_parameters,
     window_apply_parameters,
 )
-from pandas.core.window.indexers import (
-    BaseIndexer,
-    ExpandingIndexer,
-    GroupbyIndexer,
-)
 from pandas.core.window.rolling import (
     BaseWindowGroupby,
     RollingAndExpandingMixin,

pandas/core/window/rolling.py

@@ -55,6 +55,12 @@
     SelectionMixin,
 )
 import pandas.core.common as com
+from pandas.core.indexers.objects import (
+    BaseIndexer,
+    FixedWindowIndexer,
+    GroupbyIndexer,
+    VariableWindowIndexer,
+)
 from pandas.core.indexes.api import (
     DatetimeIndex,
     Index,
@@ -85,12 +91,6 @@
     window_agg_numba_parameters,
     window_apply_parameters,
 )
-from pandas.core.window.indexers import (
-    BaseIndexer,
-    FixedWindowIndexer,
-    GroupbyIndexer,
-    VariableWindowIndexer,
-)
 from pandas.core.window.numba_ import (
     generate_manual_numpy_nan_agg_with_axis,
     generate_numba_apply_func,

pandas/tests/window/test_base_indexer.py

@@ -11,7 +11,7 @@
     BaseIndexer,
     FixedForwardWindowIndexer,
 )
-from pandas.core.window.indexers import (
+from pandas.core.indexers.objects import (
     ExpandingIndexer,
     VariableOffsetWindowIndexer,
 )