деление всего на объёмы и услуги: у каждого объёма может быть услуга; у каждой услуги может быть объём

gistfile1.py

class ParamMeta(type):

    def __new__(cls, name, bases, dct):
        def _set_param(self, param):
            expected_class = globals()[self.child_param_class]
            child_dict = '_' + self.child_param_class.lower() + 's'
            if not isinstance(param, expected_class):
                raise Exception, '%s is not instance of %s' % (param.__class__, expected_class)
            self.__dict__[child_dict][param.name] = param
            self.__dict__[param.name] = param
            return self
        
        def _init(self, name, param=None):
            child_dict = '_' + self.child_param_class.lower() + 's'
            child_setter = 'set_' + self.child_param_class.lower()
            self.name = name
            self.__dict__[child_dict] = {}
            if param:
                self.__class__.__getattribute__(self, child_setter)(param)
                
        def _call(self):
            child_dict = '_' + self.child_param_class.lower() + 's'
            if self.__dict__[child_dict]:
                print '%s provides %s: %s' % \
                    (self.name, child_dict, ', '.join(self.__dict__[child_dict].keys()))
            else:
                print '%s has no %s' % (self.name, child_dict)
        
        if 'child_param_class' in dct:
            child_dict = '_' + dct['child_param_class'].lower() + 's'
            dct[child_dict] = {}
            child_setter = 'set_' + dct['child_param_class'].lower()
            dct[child_setter] = _set_param
            dct['__init__'] = _init
            dct['__call__'] = _call
        return super(ParamMeta, cls).__new__(cls, name, bases, dct)


Service = ParamMeta('Service', (), dict(child_param_class='Volume'))
Volume = ParamMeta('Volume', (), dict(child_param_class='Service'))


if __name__ == '__main__':
    whore = Service('whore')
    # quick set via constructor
    whore.set_volume(Volume('armpit', Service('rub', Volume('for_15_min'))))
    # set a bunch of services for one volume at time
    asshole = Volume('asshole') \
        .set_service(Service('puk') \
            .set_volume(Volume('pretty_much')) \
            .set_volume(Volume('not_so_much')) \
            .set_volume(Volume('srenk')) \
        ) \
        .set_service(Service('copro', Volume('for_2_hours'))) \
        .set_service(Service('fuck', Volume('until_ass_grapes_bleed')))
    whore.set_volume(asshole)
    mouth = Volume('mouth') \
        .set_service(Service('suck', Volume('until_it_sleeps'))) \
        .set_service(Service('vomit', Volume('happy_meal')))
    whore.set_volume(mouth)
    
    whore.armpit()
    whore.armpit.rub()
    whore.armpit.rub.for_15_min()
    print
    whore.asshole()
    whore.asshole.fuck()
    whore.asshole.copro()
    whore.asshole.puk()
    print
    whore.mouth()