gistfile1.txt

class BasicItemFallback(object):
	def __init__(self, property_name):
       self.property_name = property_name
    def __get__(self, obj, type=None):
        return getattr(obj.item, self.property_name)
    def __set__(self, obj, value):
        # or maybe raise?
        setattr(obj.item, self.property_name)


class ItemUser(...)
    some_item_property = BasicItemFallback('some_item_property')