codebuddy week9

ValidSudoku.py

class Solution:
    # @param A : tuple of strings
    # @return an integer
    def isValidSudoku(self, A):
       
       for i in range(9):
            ch=[0]*9
            for j in range(9):
                if(A[i][j]!='.'):
                    if(ch[ord(A[i][j])-49]==1):
                        return 0
                    ch[ord(A[i][j])-49]=1
                    
        for i in range(9):
            ch=[0]*9
            for j in range(9):
                if(A[j][i]!='.'):
                    if(ch[ord(A[j][i])-49]==1):
                        return 0
                    ch[ord(A[j][i])-49]=1
                    
        for i in range(0,8,3):
            ch=[0]*9
            for j in range(3):
                for k in range(3):
                    if(A[j][k+i]!='.'):
                        if(ch[ord(A[j][k+i])-49]==1):
                            return 0
                        ch[ord(A[j][k+i])-49]=1
                        
            ch=[0]*9
            for j in range(3):
                for k in range(3):
                    if(A[j+i][k]!='.'):
                        if(ch[ord(A[j+i][k])-49]==1):
                            return 0
                        ch[ord(A[j+i][k])-49]=1
                               
        return 1