How do I define a Python property *outside* of a class definition?

Question

I would like to define a Python property outside of a class definition:

c = C()
c.user = property(lambda self: User.objects.get(self.user_id))
print c.u         


        

Answer 1

Object instances like c cannot have properties; only classes like C can have properties. So you need to set the property on the class, not the instance, because Python only looks for it on the class:

C.user = property(lambda self: User.objects.get(self.user_id))