Check if Every Row and Column Contains All Numbers LeetCode solution in Python

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class Solution:
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    def checkValid(self, matrix: List[List[int]]) -> bool:
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        lst = [0] * len(matrix)
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        for i in matrix:
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            if len(set(i)) != len(matrix):
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                return False
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            for j in range(len(i)):
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                lst[j] += i[j]
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        return len(set(lst)) == 1