human
Here's a good function header given the following:
I wrote the below code

    content_model = None
    slug = u''
    if isinstance(content_model_or_slug, (str, _str)):
        try:
            parts = content_model_or_slug.split(u'.', 1)
            content_model = apps.get_model(*parts)
        except (TypeError, ValueError, LookupError):
            slug = content_model_or_slug
    elif issubclass(content_model_or_slug, Page):
        content_model = content_model_or_slug
    else:
        raise TypeError((u'%s    is    not    a    valid    argument    for    page_processor,    which    should    be    a    model    subclass    of    Page    in    class    or    string    form    (app.model),    or    a    valid    slug' % content_model_or_slug))
    def decorator(func):
        parts = (func, exact_page)
        if content_model:
            model_name = content_model._meta.object_name.lower()
            processors[model_name].insert(0, parts)
        else:
            processors[(u'slug:%s' % slug)].insert(0, parts)
        return func
    return decorator

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

def processor_for(content_model_or_slug, exact_page=False):