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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