Django custom tag: Inclusion tag with no context

I've read through the custom tags and filters documentation, but I'm not seeing how this can be done. I want to make a custom tag that just renders a string. No context, just the same string literal every time. In this particular case, I would prefer this over putting {% include 'hello_world.htm' %} all over the place:

Foo, foo foo
<br>
{% hello_world %}
<br>
bar bar bar

Renders to:

Foo, foo foo
<br>
"Hello World"
<br>
bar bar bar

I feel like I should be able to do this with something like:

custom_tags.py:

from django import template
register = template.Library()

@register.inclusion_tag('hello_world.htm')
def hello_world():
     return {}

# Or:

def hello_world():
     return {}
register.inclusion_tag('hello_world.htm', takes_context=False)(hello_world)

No dice. I have other custom tags in custom_tags.py, I am l开发者_运维问答oading them and they work fine, but always getting

Invalid block tag: 'hello_world', expected 'endblock' or 'endblock content'

The documentation says

Tags are more complex than filters, because tags can do anything.

... how do you do the simplest thing possible with tags?

---

You can do this with a simple tag: https://docs.djangoproject.com/en/1.3/howto/custom-template-tags/#shortcut-for-simple-tags

from django import template

register = template.Library()

@register.simple_tag
def hello_world():
    return u'Hello world'

then in your template you can write {% hello_world %} to render the string.