Shows how to realize simple pagination on Appengine

appengine_pagination.py

import os
from google.appengine.ext import webapp
from google.appengine.ext.webapp import template

class Homepage(webapp.RequestHandler):
  def render(self, values, template_name):
    path = os.path.join(os.path.dirname(__file__), template_name)
    self.response.out.write(template.render(path, values))

  def paginate(self, query):
    start = self.request.get_range('start', min_value=0, max_value=1000, default=0)
    count = self.request.get_range('count', min_value=1, max_value=100, default=10)
    # include one more story to see if we have another page, it is faster
    # to include one more story if it is there, and then throw it away for
    # the page, than issue a second query to test if there are more stories
    objects = query.fetch(count+1, start)
    # was the extra object retrieved? If so, there are more stories to go
    more_objects = len(objects) > count
    objects = objects[:count]
    # if this is not a 0 start, there are previous objects too
    prev_objects = start > 0
    # and pass in the actual number of objects that will be displayed
    prev_start = max(start-count-1, 0)
    next_start = start + len(rechnungen) - 1
    return dict(objects=objects,
                more_objects=more_objects, prev_objects=prev_objects,
                prev_start=prev_start, next_start=next_start) 

  def get(self):  # based on http://bit.ly/9kRSw4
    # Query your model you want to paginate here
    query = models.Rechnung.all().filter('kdnnr =', 'SC66669').order('-leistungsdatum')
    values = self.paginate(query)
    self.render(values, 'pageinated.html')

pageinated.html

<style type="text/css">
.pagination_prev { float: left; }
.pagination_next { float: right; }
</style>

<table>
  {% for object in objects %}
    <tr><td>{{ object }}</td></tr>
  {% endfor %}
</table>

<div class="pagination">
  {% if prev_rechnungen %}<a class="pagination_prev" href="?start={{ prev_start }}">
    ← zurück</a>{% endif %}
  {% if more_rechnungen %}<a class="pagination_next" href="?start={{ next_start }}">
    mehr →</a>{% endif %}
</div>