象棋程序中的“TypeError:'NoneType'类型的参数不可编辑”

Question

我正在编写一个国际象棋程序，在我的代码中，我的函数经常遇到这个错误。这发生在倒数第三行。 完整的回溯是：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\jacob\AppData\Local\Programs\Thonny\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "C:\Users\jacob\Desktop\chess2.py", line 96, in <lambda>
    buttons=(tk.Button(self.boardframe, padx=10,  text=self.placepieces(pos), borderwidth=0, bg=colour,  relief="solid", font=self.piecefont, command=lambda position=pos: self.movepiece(position)  ))
  File "C:\Users\jacob\Desktop\chess2.py", line 73, in movepiece
    if self.newsquare in movelist:
TypeError: argument of type 'NoneType' is not iterable

定义按钮的位置：

^{pr2}$

    def movepiece(self, squareposition):
        player=Game().player
        turn=Game().turn
        if self.square==(-10,-10):
            self.square=squareposition
            if self.square in player.position.values()==True:
                for key in player.position:
                    pieceposition=player.position.get(key)
                    if self.square==pieceposition:
                        self.piece=key
                        break
                    else:
                        pass
            else:
                self.gamelabel.config(text="Error no " +str(turn)+" piece on this square please try again")
                self.square==(-10,-10)

        else:
            self.newsquare=squareposition
            if self.newsquare==self.square:
                self.square=(-10,-10)
                self.newsquare=(-11,-11)
                self.gamelabel.config(text=str(turn)+" to move")
            else:
                movelist=player.moves.get(self.piece)
                if self.newsquare in movelist:
                   self.square=(-10,-10)
                   self.newsquare=(-11,-11)

Answer 1

出现此错误的原因可能是您试图在player.moves中访问的密钥不存在，或者该密钥的值是None。您可以通过执行健全性检查来解决此问题，以确保movelist不是{}

if movelist and self.newsquare in movelist:
   self.square=(-10,-10)
   self.newsquare=(-11,-11)