Valid Sudoku

问题：给定一个9*9的二维数组，数组元素为1~9的字符串，“，”代表为空，判断其数据的排列是否符合九宫格的规则

示例：

解决思路：分别以行、列、3*3的小九宫格为单位，使用字典对元素进行计数，初始化全部为0；对输入数组的每一个元素进行遍历，“，”跳过，数字字符则判断其在对应行、列、小九宫格中的计数是否为0，不为0则返回False

Python代码：

class Solution(object):
    def isValidSudoku(self, board):
        """
        :type board: List[List[str]]
        :rtype: bool
        """
        row = {i:{str(j):0 for j in range(1,10)} for i in range(9)}
        col = {i:{str(j):0 for j in range(1,10)} for i in range(9)}
        part = {m:{j:{str(i):0 for i in range(1,10)} for j in range(3)} for m in range(3)}
        for i in range(9):
            for j in range(9):
                ele = board[i][j]
                if ele == ".":
                    continue
                if row[i][ele] or col[j][ele] or part[i//3][j//3][ele]:
                    return False
                else:
                    row[i][ele] += 1
                    col[j][ele] += 1
                    part[i//3][j//3][ele] += 1
        return True