1768. Merge Strings Alternately - LeetCode

class Solution:
    def mergeAlternately(self, w1: str, w2: str) -> str:
        L1, L2 = len(w1), len(w2)
        result = []
        for i in range(max(L1, L2)):
            if i < L1:
                result.append(w1[i])
            if i < L2:
                result.append(w2[i])
        return ''.join(result)