You can do this with decorators like so:
class Car(object): def start(self): print 'Car has started'def extends(klass): def decorator(func): setattr(klass, func.__name__, func) return func return decorator#this can go in a different module/file@extends(Car)def do_start(self): self.start()#so can thiscar = Car()car.do_start()#=> Car has started
