Python中while的and和or

while A and B: 同时满足A和B条件
while A or B：满足A或B任意一条

以1768. 交替合并字符串官方答案为启发，以前没意识到while还可以用and和or。

其实无论用什么，只要看最后的结果是True或False

class Solution:
    def mergeAlternately(self, word1: str, word2: str) -> str:
        m, n = len(word1), len(word2)
        i = j = 0

        ans = list()
        while i < m or j < n:
            if i < m:
                ans.append(word1[i])
                i += 1
            if j < n:
                ans.append(word2[j])
                j += 1

        return "".join(ans)


print(Solution().mergeAlternately(word1="abcd", word2="pq"))