BUG: Pass kwargs from Index.to_series to pd.Series (#18707)

Author: alysivji

doc/source/whatsnew/v0.22.0.txt

@@ -279,6 +279,8 @@ Indexing
 - Bug in :func:`IntervalIndex.symmetric_difference` where the symmetric difference with a non-``IntervalIndex`` did not raise (:issue:`18475`)
 - Bug in indexing a datetimelike ``Index`` that raised ``ValueError`` instead of ``IndexError`` (:issue:`18386`).
 - Bug in tz-aware :class:`DatetimeIndex` where addition/subtraction with a :class:`TimedeltaIndex` or array with ``dtype='timedelta64[ns]'`` was incorrect (:issue:`17558`)
+- :func:`Index.to_series` now accepts ``index`` and ``name`` kwargs (:issue:`18699`)
+- :func:`DatetimeIndex.to_series` now accepts ``index`` and ``name`` kwargs (:issue:`18699`)
 
 I/O
 ^^^

pandas/core/indexes/base.py

@@ -983,20 +983,32 @@ def _format_attrs(self):
             attrs.append(('length', len(self)))
         return attrs
 
-    def to_series(self, **kwargs):
+    def to_series(self, index=None, name=None):
         """
         Create a Series with both index and values equal to the index keys
         useful with map for returning an indexer based on an index
 
+        Parameters
+        ----------
+        index : Index, optional
+            index of resulting Series. If None, defaults to original index
+        name : string, optional
+            name of resulting Series. If None, defaults to name of original
+            index
+
         Returns
         -------
         Series : dtype will be based on the type of the Index values.
         """
 
         from pandas import Series
-        return Series(self._to_embed(),
-                      index=self._shallow_copy(),
-                      name=self.name)
+
+        if index is None:
+            index = self._shallow_copy()
+        if name is None:
+            name = self.name
+
+        return Series(self._to_embed(), index=index, name=name)
 
     def to_frame(self, index=True):
         """

pandas/core/indexes/datetimes.py

@@ -932,7 +932,7 @@ def _get_time_micros(self):
             values = self._local_timestamps()
         return fields.get_time_micros(values)
 
-    def to_series(self, keep_tz=False):
+    def to_series(self, keep_tz=False, index=None, name=None):
         """
         Create a Series with both index and values equal to the index keys
         useful with map for returning an indexer based on an index
@@ -954,15 +954,24 @@ def to_series(self, keep_tz=False):
 
               Series will have a datetime64[ns] dtype. TZ aware
               objects will have the tz removed.
+        index : Index, optional
+            index of resulting Series. If None, defaults to original index
+        name : string, optional
+            name of resulting Series. If None, defaults to name of original
+            index
 
         Returns
         -------
         Series
         """
         from pandas import Series
-        return Series(self._to_embed(keep_tz),
-                      index=self._shallow_copy(),
-                      name=self.name)
+
+        if index is None:
+            index = self._shallow_copy()
+        if name is None:
+            name = self.name
+
+        return Series(self._to_embed(keep_tz), index=index, name=name)
 
     def _to_embed(self, keep_tz=False, dtype=None):
         """

pandas/tests/indexes/common.py

@@ -51,6 +51,25 @@ def test_to_series(self):
         assert s.index is not idx
         assert s.name == idx.name
 
+    def test_to_series_with_arguments(self):
+        # GH18699
+
+        # index kwarg
+        idx = self.create_index()
+        s = idx.to_series(index=idx)
+
+        assert s.values is not idx.values
+        assert s.index is idx
+        assert s.name == idx.name
+
+        # name kwarg
+        idx = self.create_index()
+        s = idx.to_series(name='__test')
+
+        assert s.values is not idx.values
+        assert s.index is not idx
+        assert s.name != idx.name
+
     def test_to_frame(self):
         # see gh-15230
         idx = self.create_index()