给定实例的方法如何获取实例? [英] How to get instance given a method of the instance?

问题描述

class MyClass:
    def myMethod(self):
        pass

myInstance = MyClass()

methodReference = myInstance.myMethod

如果您现在只能访问 methodReference，那么您现在可以获得对 myInstance 的引用吗?

Now can you get a reference to myInstance if you now only have access to methodReference?

推荐答案

如果您使用的是 Python 3:

If you are using Python 3:

methodReference.__self__

否则:

methodReference.im_self

和类似的标记，对于类:

and by a similar token, for the class:

methodReference.im_class

对于这种代码发现，您应该安装 iPython 并使用 tab，例如，在您的情况下 myReference.+TAB 会给出:

For this kind of code discovery you should install iPython and use tab, for instance, in your case myReference.+TAB would give:

In [6]: methodReference. methodReference.im_class 
methodReference.im_func   methodReference.im_self

因此，您无需担心记住太多东西——您知道该方法可能是由函数对象提供的，并且从 iPython 给出的建议中，通常很明显您正在寻找什么方法/属性.

Hence, you don't need to worry about remembering things so much - you know that the method is probably provided by the function object and from the suggestions that iPython gives it's usually obvious what method/attribute you're looking for.

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