Implementing the decorator pattern in Python

Question

I want to implement the decorator pattern in Python, and I wondered if there is a way to write a decorator that just implements the function it wants to modify, without writ

Answer 1

It's arguably not the best practice, but you can add functionality to instances, as I've done to help transition my code from Django's ORM to SQLAlachemy, as follows:

def _save(self):
    session.add(self)
    session.commit()
setattr(Base,'save',_save)