paginating markdown

model.py

class Session(models.Model):
    course = models.ForeignKey(Course, related_name='sessions')
    name = models.CharField(max_length=100)
    content = models.TextField()

    def pages(self):
        def add_h1(string):
            return "# %s" % string
        return map(add_h1, re.split(r'\n#[^#]', self.content))

    def get_page(self, page_number):
        if page_number < 1:
            raise Exception("Page number must be 1 or greater")
        elif page_number > len(self.pages())-1:
            raise Exception("Page doesn't exist")

        Page = namedtuple('Page', ['content', 'next', 'previous'])

        if page_number < len(self.pages())-1:
            next = '%s%d/' % (self.get_absolute_url(), page_number+1)
        else: next = None

        if page_number > 1:
            previous = '%s%d/' % (self.get_absolute_url(), page_number-1)
        else: previous = None

        return Page(self.pages()[page_number], next, previous)

template.html

{% extends 'base.html' %}
{% load markup %}
{% block main %}
<section id="main">
<hr>
{{ page.content|markdown }}
<hr>
{% if page.previous %}
	<a href="{{ page.previous }}">&#60;&#60; previous</a>
{% endif %}
{% if page.next %}
	<a href="{{ page.next }}">next &#62;&#62;</a>
{% else %}
	<a href="#">complete session!</a>
{% endif %}
</section>
{% endblock %}