Render only part of a django template

partial.py

from django import template

tpl = template.Template("""
{% block head %}{% endblock %}
{% block body %}
    {% block content %}{% endblock %}
{% endblock %}
""")

def getnode(node, name = 'content'):
    if hasattr(node, 'name') and node.name == name:
        return node
    if not hasattr(node, 'nodelist'):
        return None
    for child in node.nodelist:
        result = getnode(child, name)
        if result is not None:
            return result

def myhandler(request):
    if request.is_ajax:
        return getnode(tpl, 'content').render(template.Context({}))
    return tpl.render(template.Context({}))