human
I wrote the below code

    @functools.wraps(fn)
    def targeted(self, context, host, *args, **kwargs):
        mapping = objects.HostMapping.get_by_host(context, host)
        nova_context.set_target_cell(context, mapping.cell_mapping)
        return fn(self, context, host, *args, **kwargs)
    return targeted

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

def target_host_cell(fn):