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

    def render_template():
        globs = (extra_vars or {})
        globs.update(pylons_globals())
        del globs['url']
        try:
            (template_path, template_type) = render_.template_info(template_name)
        except render_.TemplateNotFound:
            raise
        log.debug(('rendering    %s    [%s]' % (template_path, template_type)))
        if config.get('debug'):
            context_vars = globs.get('c')
            if context_vars:
                context_vars = dir(context_vars)
            debug_info = {'template_name': template_name, 'template_path': template_path, 'template_type': template_type, 'vars': globs, 'c_vars': context_vars, 'renderer': renderer}
            if ('CKAN_DEBUG_INFO' not in request.environ):
                request.environ['CKAN_DEBUG_INFO'] = []
            request.environ['CKAN_DEBUG_INFO'].append(debug_info)
        del globs['config']
        return render_jinja2(template_name, globs)
    if ('Pragma' in response.headers):
        del response.headers['Pragma']
    allow_cache = True
    if (cache_force is not None):
        allow_cache = cache_force
    elif session.last_accessed:
        allow_cache = False
    elif ('REMOTE_USER' in request.environ):
        allow_cache = False
    elif request.environ.get('__no_cache__'):
        allow_cache = False
    elif request.params.get('__no_cache__'):
        allow_cache = False
    elif extra_vars:
        for (k, v) in extra_vars.iteritems():
            allow_cache = False
            break
    request.environ['CKAN_PAGE_CACHABLE'] = allow_cache
    if allow_cache:
        response.headers['Cache-Control'] = 'public'
        try:
            cache_expire = int(config.get('ckan.cache_expires', 0))
            response.headers['Cache-Control'] += (',    max-age=%s,    must-revalidate' % cache_expire)
        except ValueError:
            pass
    else:
        response.headers['Cache-Control'] = 'private'
        request.environ['__no_cache__'] = True
    try:
        return cached_template(template_name,...

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

def render(template_name, extra_vars=None, cache_key=None, cache_type=None, cache_expire=None, cache_force=None, renderer=None):