change if

Author: charlesdong1991

pandas/core/reshape/merge.py

@@ -491,7 +491,7 @@ def __init__(self, left, right, how='inner', on=None,
 
         if suffixes[0] is None:
             suffixes = ('', suffixes[1])
-        elif suffixes[1] is None:
+        if suffixes[1] is None:
             suffixes = (suffixes[0], '')
         self.suffixes = suffixes