leetcode 766. 托普利茨矩阵

class Solution:
    def isToeplitzMatrix(self, matrix):
        """
        :type matrix: List[List[int]]
        :rtype: bool
        """
        m=len(matrix)
        n=len(matrix[0])
        for i in range(m):
            data=matrix[i][0]
            j=0
            while i<m and j<n:
                if matrix[i][j] is not data:
                    return False
                i+=1
                j+=1
        for j in range(n):
            data=matrix[0][j]
            i=0
            while i<m and j<n:
                if matrix[i][j] is not data:
                    return False
                i+=1
                j+=1
        return True