POTD-Solve the Sudoku.PY

#User function Template for python3

class Solution:
    
    #Function to find a solved Sudoku. 
    def SolveSudoku(self,grid):
        def isValid(num,grid,row,col):
            for i in range(9):
                if(grid[row][i]==num):
                    return False
            for i in range(9):
                if(grid[i][col]==num):
                    return False
            rr=row-row%3
            cc=col-col%3
            for i in range(3):
                for j in range(3):
                    if(grid[rr+i][cc+j]==num):
                        return False
            return True
            
            
        for i in range(9):
            for j in range(9):
                if(grid[i][j]==0):
                    for k in range(1,10):
                        if(isValid(k,grid,i,j)):
                            grid[i][j]=k
                            ans=self.SolveSudoku(grid)
                            if(ans): return True
                            else: grid[i][j]=0
                    return False         
        return True   
        
        
        
    #Function to print grids of the Sudoku.    
    def printGrid(self,arr):
        for i in range(9):
            for j in range(9):
                print(arr[i][j],end=" ")
        # Your code here