班级中的Python True副本

Question

由于某种原因，我有一个列表，尽管明确地是深层副本，但仍在不断修改。它似乎在通过循环时没有被修饰，但是一旦存在，它突然被修改了吗？我一定缺少与Python的规则和逻辑有关的东西，但我无法为自己的一生弄清楚。

def all_possible_states(self):
    #creates many variations of a board from the available set of moves
    to_return = [] #list of possible board states to return
    #print(self.availible_moves)
    list_to_copy = copy.deepcopy(self.availible_moves)
    for item in self.availible_moves:
        print('loop')
        
        #append possible board state to list. set of availible moves for that board is one less. Done by removing item from that move list
        to_return.append(board(self.player, copy.deepcopy(self.board.copy()), list_to_copy, self.plays, self.score, copy.deepcopy(item)))
        
        #print(item)
        print( self.avalible_moves) #shows the total set of moves. This is unmodified whenever it prints
        print(list_to_copy)#deep copy of the original list. This is unmodified when it prints
        print(to_return[len(to_return) - 1].availible_moves) #List of moves left availible for the board, this slowly shrinks for some reason each loop
    
    
    print(self.availible_moves) #this is the original list, but it's not basically been cut all the way down for some reason
    return to_return

Answer 1

请注意，本地变量list_to_copy是deepcopy，而不是self.availible_moves。您要保存self.availible_moves的deepcopy，并将其存储在您定义的list_to_copy 变量中。 list_to_copy永远不会像deepcopy所预期的那样更改。我不确定您要做什么，但是如果您愿意，最终您可以重置self.availible_moves等于list_to_copy ，然后它将好像从未改变。

编辑：

实际上，我认为您有一个拼写错误，请注意您print（self.avalible_moves），而您说的是不改变，而实际上在更改的是<代码> self.availible_moves 。请注意第一个表达中的额外字母i。这绝对是您的问题之一。