class Solution:
def solveSudoku(self, board):
tmpList = self.todoList(board)
self.dfs(tmpList, board, 0)
def dfs(self, tmpList,board, k):
# 确认完成操作
if k==len(tmpList):
return True
px,py = tmpList[k]
numBoard = self.nextNum(board,px,py)
if not