gistfile1.txt

>>> class A(object):
...    def __init__(self):
...        pass
... 
>>> class B(A):
...    x = 1
... 
>>> g = B()
>>> g.__dict__
{}
>>> B.__dict__
dict_proxy({'x': 1, '__module__': '__main__', '__doc__': None})
# but lookups check instance, then class:
>>> g.x
1