Q：

输入: ["flower","flow","flight"]

输出: "fl"

class Solution:
    def longestCommonPrefix(self, strs: List[str]) -> str:
        res = ''
        for i in zip(*strs):
            # 如果集合长度为1，说明对应字符相等，截取到长度不为1的那个字符之前为止
            if len(set(i)) == 1:
                res += i[0]
            else:
                break
        return res

zip()：将对象中对应的元素打包成一个个元组，然后返回由这些元组组成的列表。

nums = ['flower', 'flow', 'flight']
for i in zip(*nums):
    print(i)

'''
输出结果：
('f', 'f', 'f')
('l', 'l', 'l')
('o', 'o', 'i')
('w', 'w', 'g')
'''