Python遊戲| TypeError：'NoneType'類型的參數是不可迭代的

Question

所以我正在通過一本python書，並被要求創建一個tic-tac-toe遊戲，並且相對地理解我所做的代碼。來吧時間來運行程序和我得到這個奇怪的錯誤

TypeError: argument of type 'NoneType' is not iterable

與完整的錯誤之中：

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 

這裏是指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) 

的代碼在以下功能中發生錯誤：

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 

我試過將move = None更改爲move = ' '，但這沒有什麼區別。有任何想法嗎？

如這裏要求是爲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名單「屈服廣場」：

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

功能你的問題是你不能做沒有變量while循環試圖算什麼，所以這是問題...

，如果你給你的代碼生病幫助下FIDLE你

Answer 3

你忘了返回legal_moves

優雅的解決辦法是什麼是使用，而不是移動列表