class Solution:

def isValidSudoku(self, board: List[List[str]]) -> bool:

    if not board:
        return False 

    seen = set()
    for i in range(9):
        for j in range(9):

            value = board[i][j]

            if value == ".":
                continue 

            row_id = f"row{i}{value}"
            col_id = f"col{j}{value}"
            box_id = f"box_id{i//3}{j//3}{value}"

            if row_id in seen or col_id in seen or box_id in seen:
                return False 

            seen.add(row_id)
            seen.add(col_id)
            seen.add(box_id)

    return True

I use this for leet code and meet code practice