如何删除实例化对象 Python？
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How to delete an instantiated object Python?
提问by user2992997
I am relatively new to object oriented programming and I cannot figure out how to delete an instantiated object in python. Any help would be much appreciated.
我对面向对象编程比较陌生，我无法弄清楚如何在 python 中删除实例化的对象。任何帮助将非常感激。
if self.hit_paddle(pos) == True or self.hit_paddle2(pos) == True:
bar = bar + 1
if bar == 1:
global barbox1
barbox1 = barfill(canvas)
barbox1.canvas.move(barbox1.id, 253, 367)
if bar == 2:
global barbox2
barbox2 = barfill(canvas)
barbox2.canvas.move(barbox2.id, 293, 367)
if bar == 3:
global barbox3
barbox3 = barfill(canvas)
barbox3.canvas.move(barbox3.id, 333, 367)
if bar == 4:
global barbox4
barbox4 = barfill(canvas)
barbox4.canvas.move(barbox4.id, 373, 367)
if bar == 5:
global barbox5
barbox5 = barfill(canvas)
barbox5.canvas.move(barbox5.id, 413, 367)
bar = 0
time.sleep(0.2)
barbox1 = None
barbox2 = None
barbox3 = None
barbox4 = None
barbox5 = None
That is the code, the main thing I was trying in order to delete the objects was barbox1 = None, but that doesn't seem to work.
这就是代码，我试图删除对象的主要内容是 barbox1 = None，但这似乎不起作用。
回答by gitesh.tyagi
object.__del__(self)is called when the instance is about to be destroyed.
object.__del__(self)在实例即将被销毁时调用。
>>> class Test:
... def __del__(self):
... print "deleted"
...
>>> test = Test()
>>> del test
deleted
Object is not deleted unless all of its references are removed(As quoted by ethan)
除非删除所有引用，否则不会删除对象（如 ethan 引用）
Also, From Python official doc reference:
另外，来自 Python 官方文档参考：
del x doesn't directly call x.del() — the former decrements the reference count for x by one, and the latter is only called when x‘s reference count reaches zero
del x 不直接调用 x。del() — 前者将 x 的引用计数减一，后者仅在 x 的引用计数达到零时调用
回答by Ethan Furman
What do you mean by delete? In Python, removing a reference (or a name) can be done with the delkeyword, but if there are other names to the same object that object will not be deleted.
你是什么意思delete？在 Python 中，可以使用del关键字来删除引用（或名称），但如果同一对象还有其他名称，则不会删除该对象。
--> test = 3
--> print(test)
3
--> del test
--> print(test)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'test' is not defined
compared to:
相比：
--> test = 5
--> other is test # check that both name refer to the exact same object
True
--> del test # gets rid of test, but the object is still referenced by other
--> print(other)
5
