zip的用法（按照index打包tuple成list）
使用例
tup = ((1, 2), (3, 4), (5, 6))
a, b = zip(*tup)
print(a, b)
>>a:[1, 3, 5]
>>b:[2, 4, 6]
tup = ((1, 2), (3, 4), (5, 6))
a, b = zip(*tup)
print(a, b)
>>a:[1, 3, 5]
>>b:[2, 4, 6]
