To clarify for non-Pythoners/non-coders: If you assume "nums" already contains the list, most of his code above is setup. You only need these two lines of his c

To clarify for non-Pythoners/non-coders: If you assume "nums" already contains the list, most of his code above is setup. You only need these two lines of his code to get the answer: import operator answer = reduce(operator.xor, nums)