在我的程序中，我创建了无穷无尽的类实例。数量取决于程序运行的时间。但是，在运行某个代码后，我根本不需要这些实例。我怎样才能将它们从内存中完全删除？
简单示例代码:
class Player:
def __init__(self, color):
self.color = color
for n in range(1000):
p = Player('black')
del p 在这种情况下会完全删除该实例吗？
请您参考如下方法:
当它们不再被引用时，Python 会为您从内存中删除它们。如果您有引用其他 Player 实例的 Player 实例(例如:p.teammates = [list of Players])，您最终可能会得到可能会阻止它们被垃圾收集的循环引用。在这种情况下，您应该考虑 weakref模块。
例如:
>>>sam = Player('blue')
>>>rob = Player('green')
>>>sam.team = [sam, rob]
>>>rob.team = [sam, rob]
>>> #sam and rob may not be deleted because they contain
>>> #references to eachother so the reference count cannot reach 0
>>>del sam #del is a way to manually dereference an object in an interactive prompt. Otherwise the interpreter cannot know you won't use it again unlike when the entire code is known at the beginning.
>>>print(rob.team[0].color) #this prints 'blue' proving that sam hasn't been deleted yet
blue
那么我们该如何解决呢？
>>>sam = Player('blue')
>>>rob = Player('green')
>>>sam.team = [weakref.ref(sam), weakref.ref(rob)]
>>>rob.team = [weakref.ref(sam), weakref.ref(rob)]
>>> #now sam and rob can be deleted, but we've changed the contents of `p.team` a bit:
>>> #if they both still exist:
>>>rob.team[0]() is sam #calling a `ref` object returns the object it refers to if it still exists
True
>>>del sam
>>>rob.team[0]() #calling a `ref` object that has been deleted returns `None`
None
>>>rob.team[0]().color #sam no longer exists so we can't get his color
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'NoneType' object has no attribute 'color'
