class Solution(object):
    def isValidSudoku(self, board):
        """
        :type board: List[List[str]]
        :rtype: bool
        两种思路：
        1.逐元素读
        2.逐行、列、九宫格读
        逐元素读快吧？
        """
        for i in range(len(board)):
            list_int=['1','2','3','4','5','6','7','8','9']
            for j in range(len(board[0])):
                if board[i][j]=='.':
                    pass
                elif board[i][j] in list_int:
                    list_int.pop(list_int.index(board[i][j]))
                else:
                    return False
        for i in range(len(board)):
            list_int=['1','2','3','4','5','6','7','8','9']
            for j in range(len(board[0])):
                if board[j][i]=='.':
                    pass
                elif board[j][i] in list_int:
                    list_int.pop(list_int.index(board[j][i]))
                else:
                    return False
        #return True
        def SmallSodoku(i,j):
            list_int = ['1', '2', '3', '4', '5', '6', '7', '8', '9']
            for m in range(i,i+3):
                for n in range(j,j+3):
                    if board[m][n] == '.':
                        pass
                    elif board[m][n] in list_int:
                        list_int.pop(list_int.index(board[m][n]))
                    else:
                        return False
        for i in range(3):
            for j in range(3):#board[3*(i+1)][3*(j+1)]顶点坐标
                if SmallSodoku(3*i,3*j)==False:
                    return False
                else:
                    pass
        return True

基本题型，普通思路