[LeetCode] 36. Valid Sudoku

Python

class Solution:
    def isValidSudoku(self, board: List[List[str]]) -> bool:
        for i in range(len(board)):
            row = []
            col = []
            
            for j in range(len(board)):
                if board[i][j] != '.' and board[i][j] in row:
                    return False
                else:
                    row.append(board[i][j])
                    
                if board[j][i] != '.' and board[j][i] in col:
                    return False
                else:
                    col.append(board[j][i])
                    
        for i in range(0,len(board),3):
            for j in range(0,len(board),3):
                temp = []
                for k in range(3):
                    for l in range(3):
                        data = board[i+k][j+l]
                        if board[i+k][j+l] != '.' and board[i+k][j+l] in temp :
                            return False
                        else:
                            temp.append(board[i+k][j+l])
        
        return True