using dejavu-orm

[yoohoow]

Is any body use dejavu object relational mapper? I follow the dejavu pdf tutorial and try to run the example code . it's bad.

 
import dejavu
class Zoo(dejavu.Unit):
    Name = dejavu.UnitProperty()
    Size = dejavu.UnitProperty(int)
 
    def total_legs(self):
        return sum([x.Legs for x in self.Animal()])
class Animal(dejavu.Unit):
    Legs = dejavu.UnitProperty(int, default=4)
Animal.set_properties({"Name": unicode,
                       "ZooID": int,
                       })
Animal.many_to_one('ZooID', Zoo, 'ID')
# Set up a global Arena object.
arena = dejavu.Arena()
conf = {u'Connect': r"PROVIDER=MICROSOFT.JET.OLEDB.4.0;DATA SOURCE=C:\zookeeper.mdb;"}
arena.add_store("main", "access", conf)
arena.register_all(globals())
 

I don't know "self.Animal()" what it means. why it can write as such?
and
how do I write the code if I want to connect sqlite db?