Just use this function to grab all your parents' private variables in a list.

get_private_inherited_attrs.py

def _append_private_attr(cls,inst,propname,ret):
    attrname = '_%s__%s' %(cls.__name__, propname)
    if hasattr(inst,attrname):
        ret.append( getattr(inst,attrname) )
        pass

def get_private_inherited_attrs(cls,inst,propname,ret=None):
    """
Just use this function to grab all your parents private variables in a list.

Motivation:

        In python, using private class variables (vars that start with __)
    don't work at all when using super.  (the descriptor doesn't get private
    class varialbes for whatever reason)

    this makes it extrmely hard to use with super(), hence this routine.

Usage:

    class B:
        __my_prop_name = ['B-val',0,1,2,3]
        pass

    class B2:
        __my_prop_name = ['B2-val',10,11,12,13]
        pass

    class A(B,B2):
        __my_prop_name = ['A-val',4,5,6,7]
        pass

    a = A()
    results = get_private_inherited_attrs(a.__class__,a,'my_prop_name')

    """
    if ret is None:
        ret = []
        pass

    _append_private_attr(cls,inst,propname,ret)

    if hasattr(cls,'__mro__'):
        for base in cls.__mro__:
            _append_private_attr(base,inst,propname,ret)
            pass
        return ret
    else:
        # ok old style class, hope there's no dreaded diamond...
        for base in cls.__bases__:
            _append_private_attr(base,inst,propname,ret)
            get_private_inherited_attrs(base,inst,propname,ret)
            pass
        return ret
    pass