Python：获取实例化类的名称？

Question

Example:

class Class1:
    def __init__(self):
        self.x = Class2('Woo!')

class Class2:
    def __init__(self, word):
        print word

meow = Class1()

How do I derive the class name that created the self.x instance? In other words, if I was given the instance self.x, how do I get the name 'Class1'? Using self.x.__class__.__name__ will obviously only give you the Class2 name. Is this even possible? Thanks.

Answer 1

You can't, unless you pass an instance of the 'creator' to the Class2() constructor. eg

class Class1(object):
    def __init__(self, *args, **kw):
        self.x = Class2("Woo!", self)

class Class2(object):
    def __init__(self, word, creator, *args, **kw):
        self._creator = creator
        print word

This creates an inverse link between the classes for you

Answer 2

Set a variable on the class in question in your __init__() method that you then retrieve later on.

You'll get better answers if you ask better questions. This one is pretty unclear.

Answer 3

Your question is very similar to answered here . Note, that you can determine who created the instance in its constructor, but not afterwards. Anyway, the best way is to pass creator into constructor explicitly.