unbind method from instance and bind to other instance

Question

I have read this. is it possible to change: a1.show to a2.show, I mean, change the orientation of the method to point to different instance.

class A:
    def __init__(self, a):
        self.a = a

    def show(self):
        print(self.a)


a1 = A(1)
a2 = A(2)
mtd = staticmethod(a1.show)
mtd(a2)

I want to see 2 in console. I mean, for a normal method in class, change its instance, from a1 to a2?

---

You may wonder why I do this, I have got a decorator to record what the instance has been through.

class Data:

    def __init__(self):
        self.caches = []

    # do not call it outside of class, it is used to record procedure 
    def add_cache(self, val):
        self.caches.append(val)

    def clean_cache(self):
        self.caches = []

    def record(foo):
        def wrapper(self, *args, **kwargs):
            self.add_cache({foo.__name__: {'args': args, 'kwargs': kwargs}})
            return foo(self, *args, **kwargs)
        return wrapper

Now, I can add this decorator to the function that needs to be recorded every call. For example, I want linear to be recorded but wrap.

class Data:
    def wrap(self):
        print('wrap')

    @record
    def linear(self, least_square=True):
        pass

Now, I am allowed to define a simulate function, which pass in another instance, and let it be through what this instance has been through.

But, my cache only recorded foo.__name__, which I need to write my own mapper to decide which function to call. This is complex. Therefore, instead of recording foo.__name__, I want to directly record foo and change its orientation from self to other.

Hope I have explained with enough clarity. I will be so glad if you give me a hand.

Answer 1

I just noticed python object's methods are not bonded to instance, which if I store foo in record, I need to pass in self as first argument.

    def simulate(self, other):
        for di in self.caches:
            kk = list(di.keys())[0]
            vv = list(di.values())[0]
            kk(other, *vv['args'], **vv['kwargs'])
        return self

This works out.