@staticmethod
def apply_noop(aggregate, event):
    """
        Aggregate event handler function that acts as a no-op

        Event handlers that do something should return a new aggregate with
        updated state.  For example:

            @staticmethod
            def apply_hello_world(aggregate):
                return aggregate.set_state('hello', 'world')

        Arguments:
        aggregate -- Aggregate instance to which the event will be applied
        event -- Event instance to "apply" to the `aggregate`
        """
    return aggregate
