python_override.py

def overrides(interface_class):
    def overrider(method):
        assert(method.__name__ in dir(interface_class))
        return method
    return overrider

class MySuperInterface(object):
    def my_method(self):
        print('hello world!')

class ConcreteImplementer(MySuperInterface):
    @overrides(MySuperInterface)
    def my_method(self):
        print('hello kitty!')


x = ConcreteImplementer()
x.my_method()