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Python的Object基类__del__方法
Python的这个方法是一个析构方法，是在实例被销毁的时候执行的，销毁实例相关的内存，方法，属性等。同样是如果基类指定了特殊的属性或者其他方法，那么子类也是需要显式的指定的。
一般情况下无需覆盖这个方法。
Python3.4文档：
object. __del__ ( self )Called when the instance is about to be destroyed. This is also called a destructor. If a base class has a __del__() method, the derived class’s __del__() method, if any, must explicitly call it to ensure proper deletion of the base class part of the instance. Note that it is possible (though not recommended!) for the __del__() method to postpone destruction of the instance by creating a new reference to it. It may then be called at a later time when this new reference is deleted. It is not guaranteed that __del__() methods are called for objects that still exist when the interpreter exits