从 sprites.Group() 中删除/删除第一个 N 或最后一个 N答案

【问题标题】：Deleting/Removing the first N or last N from a sprites.Group()从 sprites.Group() 中删除/删除第一个 N 或最后一个 N
【发布时间】：2013-04-18 13:07:18
【问题描述】：

假设您有一个精灵组，并且您向其中添加了一堆东西：

all_shelfs = pygame.sprite.Group()
shelf_tracking_list = []

#making shelfs
build_lvl = HEIGHT - 150
#group A
for i in xrange(100):
    wid = random.randint(120,320)
    pos = [random.randint(0, WIDTH-wid), random.randint(build_lvl-20, build_lvl), wid]
    all_shelfs.add(Shelf(pos[0],pos[1], pos[2]))
    build_lvl = build_lvl - 60

#group B
for i in xrange(100):
    wid = random.randint(120,320)
    pos = [random.randint(0, WIDTH-wid), random.randint(build_lvl-20, build_lvl), wid]
    all_shelfs.add(Shelf(pos[0],pos[1], pos[2]))
    build_lvl = build_lvl - 60
#group C
for i in xrange(100):
    wid = random.randint(120,320)
    pos = [random.randint(0, WIDTH-wid), random.randint(build_lvl-20, build_lvl), wid]
    all_shelfs.add(Shelf(pos[0],pos[1], pos[2]))
    build_lvl = build_lvl - 60

shelf_tracking_list = all_shelfs.sprites()

例如，我如何删除 A 组？这是我添加的第一组。我注意到我无法真正使用这个shelf_tracking_list 修改组

【问题讨论】：

标签： python python-2.7 pygame

【解决方案1】：

如果您要跟踪每个组中的精灵，您可以使用sprite.Group.remove(*sprites) 函数来删除整个组，如以下文档中所述：http://www.pygame.org/docs/ref/sprite.html#pygame.sprite.Group.remove

# group A
group_a = list()
for i in xrange(100):
    wid = random.randint(120,320)
    pos = [random.randint(0, WIDTH-wid), random.randint(build_lvl-20, build_lvl), wid]
    new_shelf = Shelf(pos[0], pos[1], pos[2])
    group_a.append(new_shelf)
    build_lvl = build_lvl - 60
all_shelfs.add(group_a)

那么当你想从all_shelfs中删除整个组时：

all_shelfs.remove(group_a)

【讨论】：

【解决方案2】：

由于您要问的是如何删除逻辑组，而不仅仅是 N 个元素：根据您的程序，将精灵放在多个组中可能会大大简化事情。

您可以将一个精灵放在多个组中以引用同一个精灵。然后，如果您 kill() 它，会将其从所有组中删除。否则 remove(*groups) 用于删除特定组。

for i in xrange(100):
    wid = random.randint(120,320)
    pos = [random.randint(0, WIDTH-wid), random.randint(build_lvl-20, build_lvl), wid]
    shelf = Shelf(pos[0],pos[1], pos[2])
    all_shelfs.add(shelf)
    shelfs_a.add(shelf)
    build_lvl = build_lvl - 60

#group B
for i in xrange(100):
    wid = random.randint(120,320)
    pos = [random.randint(0, WIDTH-wid), random.randint(build_lvl-20, build_lvl), wid]
    shelf = Shelf(pos[0],pos[1], pos[2])
    all_shelfs.add(shelf)
    shelfs_b.add(shelf)
    build_lvl = build_lvl - 60

# ...

# then to erase from both groups
for shelf in shelfs_a:
    shelf.kill()

【讨论】：