How to copy an App Engine Datastore entity

How can I copy an entity created from my Geo model:

class Geo(db.Model):
    title = db.StringProperty()
    link = db.StringProperty()
    updated = db.DateTimePropert开发者_C百科y(auto_now =True)
    author = db.ReferenceProperty(MyUser)
    id = db.StringProperty()
    entry = db.ListProperty(db.Key)