Python游戏| TypeError：'NoneType'类型的参数是不可迭代的

Question

所以我正在通过一本python书，并被要求创建一个tic-tac-toe游戏，并且相对地理解我所做的代码。来吧时间来运行程序和我得到这个奇怪的错误

TypeError: argument of type 'NoneType' is not iterable

与完整的错误之中：

Traceback (most recent call last): 
    File "Tac Tac Toe Game revised.py", line 182, in <module> 
    main() 
    File "Tac Tac Toe Game revised.py", line 173, in main 
    move = human_move(board, human) 
    File "Tac Tac Toe Game revised.py", line 100, in human_move 
    while move not in legal: 
TypeError: argument of type 'NoneType' is not iterable 

这里是指line 173

def main(): 
    display_instruction() 
    computer,human = pieces() 
    turn = X 
    board = new_board() 
    display_board(board) 

    while not winner(board): 
     if turn == human: 
      move = human_move(board, human) 
      board[move] == human 
     else: 
      move = computer_move(board,computer,human) 
      board[move] == computer 
     display_board(board) 
     congrats_winner(the_winner,computer, human) 

的代码在以下功能中发生错误：

def human_move(board,human): 
'''Get human move''' 
legal = legal_moves(board) 
move = None 
while move not in legal: 
    move = ask_number('Where will you move? (0-8): ',0, NUM_SQUARES) 
    if move not in legal: 
     print ('\nThat square is already occupied, foolish human. Choose another.\n') 
print('Fine...') 
return move 

我试过将move = None更改为move = ' '，但这没有什么区别。有任何想法吗？

如这里要求是为legal_moves

def legal_moves(board): 
'''Creates a legal list of moves''' 
    moves = [] 
    for square in range(NUM_SQUARES): 
     if board[square] == EMPTY: 
      moves.append(square) 

Answer 1

您需要返回moves名单“屈服广场”：

def legal_moves(board): 
    '''Creates a legal list of moves''' 
    moves = [] 
    for square in range(NUM_SQUARES): 
     if board[square] == EMPTY: 
      moves.append(square) 
    return moves 

Answer 2

功能你的问题是你不能做没有变量while循环试图算什么，所以这是问题...

，如果你给你的代码生病帮助下FIDLE你

Answer 3

你忘了返回legal_moves

优雅的解决办法是什么是使用，而不是移动列表