[Solved] one self for class in class

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You only defined classes inside the namespace of class User. An instance of User don’t have magically instances of the inner classes (i.e. in Python there is nothing like a inner class). So class definitions inside other classes in normally not useful.

You have to give the other classes an explicit reference to your user object:

class User(object):
     def __init__(self)
         self.user_session = Session()
         self.action = Action(self)
         self.listing = Listing(self)

     def wallet_sum(self):
         self.user_session.get('current wallet sum')

 class Action(object):
     def __init__(self, user):
         self.user_session = user.user_session 

     def buy_dog(self):
         self.user_session.post('buy_dog')

 class Listing(object)
     def __init__(self, user):
         self.user = user

     def my_dogs(self):
         self.user.user_session.get('all_my_dogs')

user = User()
user.action.buy_dog()
user.listing.my_dogs()

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solved one self for class in class