comments

Author: Ben Kandel

pandas/tools/merge.py

@@ -1457,10 +1457,7 @@ def __init__(self, objs, axis=0, join='outer', join_axes=None,
         self.axis = axis
         self.join_axes = join_axes
         self.keys = keys
-        if names is None and hasattr(keys, 'names'):
-            self.names = keys.names
-        else:
-            self.names = names
+        self.names = names or getattr(keys, 'names', None)
         self.levels = levels
 
         self.ignore_index = ignore_index