python - 如何在Python中销毁一个对象？

Question

我有一个计时器类，我设计它触发一次，然后(最好)删除自身。有没有办法让我实现 self 删除？

class timer:
        def __init__(self, duration, function, args):
            self.duration = duration
            self.function = function
            self.args = args
        def start(self):
            self.time = time.time()
            self.validity = True    
        def check(self):
            if(int(self.time)+self.duration < time.time() ):
                self.function(self.args)
                self.validity = False
        def __del__(self):
            print("timer destroyed")

Answer 1

您可以遵循类似的方法。

可以调用object.__del__(self)来销毁实例。

>>> class Test:
...     def __del__(self):
...         print "deleted"
... 
>>> test = Test()
>>> del test
deleted

除非删除其所有引用，否则不会删除对象

此外，来自 Python 官方文档引用:

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

您的解决方案中需要的是使用类似 del object 的内容，其中该对象是您要删除的实例。