Update xor-operation-in-an-array.py

Author: kamyu104

Python/xor-operation-in-an-array.py

@@ -21,6 +21,9 @@ def xorNumsBeginEven(n, start):
 
 # Time:  O(n)
 # Space: O(1)
+import operator
+
+
 class Solution2(object):
     def xorOperation(self, n, start):
         """