I am trying to figure out templatetags, and I keep getting the
following error:

'get_latest' is not a valid tag library: Could not load template
library from django.templatetags.get_latest, No module named
get_latest

I started with this guide: 
http://www.b-list.org/weblog/2006/jun/07/django-tips-write-better-template-tags/

I have the file saved as "get_latest.py" in the "templatetags"
directory, which is in my "blog" app. I have set the blog app as an
installed app in the settings.

Here is the code that I am using:

from django.template import Library, Node
from django.db.models import get_model

register = Library()

class LatestContentNode(Node):
    def __init__(self, model, num, varname):
        self.num, self.varname = num, varname
        self.model = get_model(*model.split('.'))

    def render(self, context):
        context[self.varname] = self.model._default_manager.all()
[:self.num]
        return ''

def get_latest(parser, token):
    bits = token.contents.split()
    if len(bits) != 5:
        raise TemplateSyntaxError, "get_latest tag takes exactly four
arguments"
    if bits[3] != 'as':
        raise TemplateSyntaxError, "third argument to get_latest tag
must be 'as'"
    return LatestContentNode(bits[1], bits[2], bits[4])

get_latest = register.tag(get_latest)

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