如何深度复制 pygame 精灵组？答案

【问题标题】：How can I deepcopy a pygame sprite group?如何深度复制 pygame 精灵组？
【发布时间】：2019-08-14 18:46:00
【问题描述】：

我正在尝试使用蒙特卡罗树搜索来实现国际象棋 AI。这需要从每个位置玩 800 场随机游戏来评估每一步的价值。但是，我使用 pygame sprite 组来保存棋子的实例，然后我循环遍历以查找该位置中每个棋子的可能移动。当我拿一块时，我会使用 .kill() 函数，否则我的 legal_moves() 函数会返回已拿走的棋子的移动。但是，当它用于搜索时，它也会杀死游戏中的棋子，我不希望它这样做。

我尝试过使用内置的复制功能，但这只是一个浅拷贝。我尝试了 copy.deepcopy(piece_list)，但这给出了错误消息：

File "C:\Users\Sean\PycharmProjects\Chess\Monte_Carlo_Tree_Search.py", line 339, in run_mcts
exploration_game = copy.deepcopy(game)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py",  line 180, in deepcopy
y = _reconstruct(x, memo, *rv)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py",  line 280, in _reconstruct
state = deepcopy(state, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py",  line 150, in deepcopy
y = copier(x, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py",  line 240, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py",  line 180, in deepcopy
y = _reconstruct(x, memo, *rv)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 280, in _reconstruct
state = deepcopy(state, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 150, in deepcopy
y = copier(x, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 240, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 150, in deepcopy
y = copier(x, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 240, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 180, in deepcopy
y = _reconstruct(x, memo, *rv)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 280, in _reconstruct
state = deepcopy(state, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 150, in deepcopy
y = copier(x, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 240, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)

File "C:\Users\Sean\AppData\Local\Programs\Python\Python37-32\lib\copy.py", line 169, in deepcopy
rv = reductor(4)

TypeError: can't pickle pygame.Surface objects

我在网上浏览了一下，但似乎没有一个回答提供了一种方法，而是一种替代方法。

import pygame

knight = pygame.sprite.Sprite()
piece_list = pygame.sprite.Group()
piece_list.add(knight)

piece_list_copy = piece_list.copy()

for piece in piece_list_copy:
    piece.kill()

print(piece_list)

我想要一些更改此代码的方法，使其返回“Group(1 sprites)”，而不是“Group(0 sprites)”

【问题讨论】：

刚刚意识到，在错误示例中，我试图对整个游戏对象进行深度复制...单独进行操作我得到了相同的结果。

标签： python pygame copy sprite deep-copy

【解决方案1】：

.copy() 创建一个新组，其中包含与组相同的精灵，但精灵不会（深度）复制。

您可以使用 .remove() 从单个 pygame.sprite.Group 中删除 Sprite：

for piece in piece_list_copy:
    piece_list.remove(piece)

【讨论】：