revert combine change

TomAugspurger · Apr 25, 2018 · b7ae0bc · b7ae0bc
1 parent 125ca0b
commit b7ae0bc
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/pandas/core/series.py b/pandas/core/series.py
@@ -2185,7 +2185,7 @@ def _binop(self, other, func, level=None, fill_value=None):
             result.name = None
         return result
 
-    def combine(self, other, func, fill_value=None):
+    def combine(self, other, func, fill_value=np.nan):
         """
         Perform elementwise binary operation on two Series using given function
         with optional fill value when an index is missing from one Series or