Python classes

# -*- coding: utf-8 -*-

from functools import wraps

def self_wrapper(meth):

    @wraps(meth)
    def wrapper(self_instance):
        return meth(self_instance._i)

    return wrapper

class B:
    def __init__(self, instance):
        self._i = instance

    @self_wrapper
    def f(self):
        return self.x

class A:
    x = 5

    def __init__(self):
        self.b = B(self)

a = A()
print a.b.f()