Python: accessing attributes and methods of one class in another

Question

Let's say I have two classes A and B:

Class A:
   # A's attributes and methods here

Class B:
  # B's attributes and methods here

Now I can assess A's properties in object of B class as follows:

a_obj = A()
b_obj = B(a_obj)

What I need is a two way access. How do I access A's properties in B and B's properties in A ?

Answer 1

You need to create pointers either way:

class A(object):
    parent = None


class B(object):
    def __init__(self, child):
        self.child = child
        child.parent = self

Now A can refer to self.parent (provided it is not None), and B can refer to self.child. If you try to make an instance of A the child of more than one B, the last 'parent' wins.