CLN import from pandas.core.arrays when possible (pandas-dev#23193)

Author: JustinZhengBC

pandas/core/arrays/datetimes.py

@@ -508,7 +508,7 @@ def _add_delta(self, delta):
         The result's name is set outside of _add_delta by the calling
         method (__add__ or __sub__)
         """
-        from pandas.core.arrays.timedeltas import TimedeltaArrayMixin
+        from pandas.core.arrays import TimedeltaArrayMixin
 
         if isinstance(delta, (Tick, timedelta, np.timedelta64)):
             new_values = self._add_delta_td(delta)
@@ -803,7 +803,7 @@ def to_period(self, freq=None):
         pandas.PeriodIndex: Immutable ndarray holding ordinal values
         pandas.DatetimeIndex.to_pydatetime: Return DatetimeIndex as object
         """
-        from pandas.core.arrays.period import PeriodArrayMixin
+        from pandas.core.arrays import PeriodArrayMixin
 
         if self.tz is not None:
             warnings.warn("Converting to PeriodArray/Index representation "

pandas/core/arrays/period.py

@@ -302,7 +302,7 @@ def to_timestamp(self, freq=None, how='start'):
         -------
         DatetimeArray/Index
         """
-        from pandas.core.arrays.datetimes import DatetimeArrayMixin
+        from pandas.core.arrays import DatetimeArrayMixin
 
         how = libperiod._validate_end_alias(how)
 

pandas/core/groupby/generic.py

@@ -44,7 +44,7 @@
 from pandas.core.dtypes.cast import maybe_downcast_to_dtype
 from pandas.core.base import SpecificationError, DataError
 from pandas.core.index import Index, MultiIndex, CategoricalIndex
-from pandas.core.arrays.categorical import Categorical
+from pandas.core.arrays import Categorical
 from pandas.core.internals import BlockManager, make_block
 from pandas.compat.numpy import _np_version_under1p13
 

pandas/tests/arrays/test_datetimelike.py

@@ -5,9 +5,9 @@
 import pandas as pd
 import pandas.util.testing as tm
 
-from pandas.core.arrays.datetimes import DatetimeArrayMixin
-from pandas.core.arrays.timedeltas import TimedeltaArrayMixin
-from pandas.core.arrays.period import PeriodArrayMixin
+from pandas.core.arrays import (DatetimeArrayMixin,
+                                TimedeltaArrayMixin,
+                                PeriodArrayMixin)
 
 
 # TODO: more freq variants