>>107
ならば俺がネタを提供。

>>>arr1 = ["hoge1","hoge2","hoge3","hoge4"]
>>>arr2 = ["hoge3","hoge4","hoge5","hoge6"]

>>>print xor(arr1, arr2)
["hoge1","hoge2","hoge5","hoge6"]

ってなかんじの関数ください。
とか。