human
I wrote the below code

    if hasattr(loader, RESTORE_LOADERS_ATTR):
        raise Exception(('loader.%s    already    exists' % RESTORE_LOADERS_ATTR))
    def test_template_loader(template_name, template_dirs=None):
        'A    custom    template    loader    that    loads    templates    from    a    dictionary.'
        try:
            return (templates_dict[template_name], ('test:%s' % template_name))
        except KeyError:
            raise TemplateDoesNotExist(template_name)
    if use_cached_loader:
        template_loader = cached.Loader(('test_template_loader',))
        template_loader._cached_loaders = (test_template_loader,)
    else:
        template_loader = test_template_loader
    setattr(loader, RESTORE_LOADERS_ATTR, loader.template_source_loaders)
    loader.template_source_loaders = (template_loader,)
    return template_loader

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

def setup_test_template_loader(templates_dict, use_cached_loader=False):