def addSMS(cls):

    class AddSMS(cls):

        def send(self, message):
            super().send(message)
            print("SMS sent")

    return AddSMS

def addFackbook(cls):

    class AddFackbook(cls):

        def send(self, message):
            super().send(message)
            print("Fackbook sent")

    return AddFackbook

@addSMS
@addFackbook
class Notifier:
    def send(self, message):
        print("Email sent")

Notifier().send("123")