Accessing parent objects

[Jugurtha Hadjar]

On 03/24/2018 07:14 PM, D'Arcy Cain wrote:
> class C1(dict):
>    class C2(object):
>      def f(self):
>        return X['field']
>
> O1 = C1()
> O1['field'] = 1
> O2 = O1.C2()
> print(O2.f())

I prefer to *feed* the child to the parent or vice versa. Simplifies 
things like testing.

Something like this:

<---------------------------------------------------------------------->

class C1(object):
     def __init__(self):
         self.child = None

     def foo(self):
         print("I am {self.__class__.__name__} foo".format(self=self))

     def adopt(self, child=None):
         self.child = child
         s = ("I am {self.__class__.__name__} and I adopted "
"{self.child.__class__.__name__}".format(self=self))
         print(s)


class C2(object):
     def __init__(self, parent=None):
         self.parent = parent
     def foo(self):
         print("I am {self.__class__.__name__} foo".format(self=self))
         self.parent.foo()

     def adoptme(self, parent=None):
         parent = parent or self.parent
         if parent is None:
             print("No parent yet")
         else:
             self.parent = parent
             parent.adopt(self)

c2 = C2()
c2.adoptme()    # No parent yet

c1 = C1()
c2.adoptme(c1)  # I am C1 and I adopted C2
c2.foo()        # I am C2 foo
                 # I am C1 foo

c1.adopt(c2)    # I am C1 and I adopted C2

<-------------------------------------------------------------------->



-- 
~ Jugurtha Hadjar,