human
I wrote the below code

    def decorator(f):
        known_services = get_service_list()
        for service in args:
            if (service not in known_services):
                raise InvalidServiceTag(('%s    is    not    a    valid    service' % service))
        decorators.attr(type=list(args))(f)
        @functools.wraps(f)
        def wrapper(self, *func_args, **func_kwargs):
            service_list = get_service_list()
            for service in args:
                if (not service_list[service]):
                    msg = ('Skipped    because    the    %s    service    is    not    available' % service)
                    raise testtools.TestCase.skipException(msg)
            return f(self, *func_args, **func_kwargs)
        return wrapper
    return decorator

What's a good function header?

=====
Here's a good function header?
assistant
#Here's a good function header.

def services(*args):