mixin vs class decorator to add a method

# mixin example

class HelloMixin(object):
  def sayHello(self):
    return "Hello, %s" % self.name


class Person(HelloMixin): # might have more base classes
  def __init__(self, name, age):
    self.name = name
    self.age = age
  # ...

joe = Person('Joe', 15)
print joe.sayHello()


# decorated class example

def SayingHello(target_class):
  def sayHello(self):
    return "Hello, %s" % self.name
  target_class.sayHello = sayHello  # assign
  return target_class  # which we modified

@SayingHello
class Person(HelloMixin): # might have more base classes
  def __init__(self, name, age):
    self.name = name
    self.age = age

jane = Person('Jane', 77)
print jane.sayHello()