BUG: Index.to_series() is not copying the index

Author: jreback

pandas/indexes/base.py

@@ -944,7 +944,7 @@ def to_series(self, **kwargs):
         """
 
         from pandas import Series
-        return Series(self._to_embed(), index=self, name=self.name)
+        return Series(self._to_embed(), index=self.copy(), name=self.name)
 
     def _to_embed(self, keep_tz=False):
         """

pandas/tests/indexes/common.py

@@ -38,6 +38,15 @@ def test_pickle_compat_construction(self):
         # need an object to create with
         self.assertRaises(TypeError, self._holder)
 
+    def test_to_series(self):
+        # assert that we are creating a copy of the index
+
+        idx = self.create_index()
+        s = idx.to_series()
+        assert s.values is not idx.values
+        assert s.index is not idx
+        assert s.name == idx.name
+
     def test_shift(self):
 
         # GH8083 test the base class for shift

pandas/tseries/index.py

@@ -895,7 +895,9 @@ def to_series(self, keep_tz=False):
         Series
         """
         from pandas import Series
-        return Series(self._to_embed(keep_tz), index=self, name=self.name)
+        return Series(self._to_embed(keep_tz),
+                      index=self.copy(),
+                      name=self.name)
 
     def _to_embed(self, keep_tz=False):
         """