修正Tic Tac Toe-Draw函数

def draw(board):
    """
    绘制井字棋游戏棋盘
    """
    print("---------")
    for row in board:
        print("|", end="")
        for cell in row:
            print(cell, end="|")
        print("\n---------")

def is_draw(board):
    """
    判断是否为平局
    """
    for row in board:
        for cell in row:
            if cell == " ":
                return False
    return True

# 示例用法
board = [["X", "O", "X"],
         ["O", "X", "O"],
         ["O", "X", "O"]]

draw(board)

if is_draw(board):
    print("平局！")
else:
    print("游戏继续！")