LeetCode 习题 819. 最常见的单词

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class Solution:
    def mostCommonWord(self, paragraph: str, banned: List[str]) -> str:
        p = paragraph[:].lower()
        for i in "!?',;.":
            p = p.replace(i, " ")
        return __import__("collections").Counter([i for i in p.split() if i not in banned]).most_common(1)[0][0]