Most common word

Code

O() : 32 ms, faster than 69.89% of Python3

from collections import Counter
import re

class Solution:
    def mostCommonWord(self, paragraph: str, banned) -> str:
        paragraph = re.split("[!?',;. ]", paragraph.lower())
        paragraph = [word for word in paragraph if word not in banned and word != '']
        return max(Counter(paragraph).items(), key = lambda item: item[1])[0]