gistfile1.py

class Bla(object):
    def __init__(self, a): 
        self.a = a 

class Bleh(object):
    def __init__(self, bla):
        self.bla = bla 

    def __getattr__(self, name):
        return getattr(self.bla, name)

my_bla = Bla("this is a bla!")
my_bleh = Bleh(my_bla)

print my_bleh.a