Example of dynamically decorating a method in Python

dynamic_decorator_example.py

import functools

class Scooby(object):
    def mood(self):
        return 'frightended'


def scooby_snack(func):
    @functools.wraps(func)
    def brave(self):
        return 'not ' + func(self)

    return brave


scooby = Scooby()
print('Scooby: <' + scooby.mood() + '>')

print('Fred: Would you do it for a Scooby Snack?')

Scooby.mood = scooby_snack(Scooby.mood)
print('Scooby: <' + scooby.mood() + '>')