Accessing django sessions via a WSGI Middleware. Can be used in any python web stack that conforms to the PEP 333 WSGI specification. This includes bottle.

djangosession.py

import os
os.environ['DJANGO_SETTINGS_MODULE'] = 'settings' #not using env.put as that does not execute immediately
from django.conf import settings
SessionStore = __import__(settings.SESSION_ENGINE, fromlist=['']).SessionStore

class DjangoSessionWSGIMiddleware(object):
    transform = false #doesn't transform output of anything above in the stack
    
    def __init__(self, app):
        self.app = app
        
    def __call__(self, environ, start_response):
        if 'HTTP_COOKIE' in environ:
            cookie = {s.split('=')[0].strip(): s.split('=')[1].strip() for s in environ['HTTP_COOKIE'].split(';')}
            if 'sessionid' in cookie:
                session = SessionStore(session_key=cookie['sessionid'])
                if session.exists(cookie['sessionid']):
                    session.load()
                    user_id = session.get('_auth_user_id')
                    # From here, you can load your user's django object
                    # and attach it to the environ object
                    # for example:
                    from django.contrib.auth.models import User
                    environ['CURRENT_USER'] = User.objects.get(id=user_id)
                    
                    return self.app(environ, start_response) #this MUST occur, otherwise nothing above this in the stack will execute
                    
        # bounce the user since they're not logged in.
        # alternatively, give them a redirect to the django login page
        start_response('401 Unauthorized', [('Content-type', 'text/plain')])
        return 'Not logged in.'

simplebottle.py

from bottle import app, request, route, run
from djangosession import DjangoSessionWSGIMiddleware

app = DjangoSessionWSGIMiddleware(app())

@route('/', method='GET')
def hello():
    # since our middleware attaches the django user to the environ object,
    # we can access it through the bottle request object like so:
    user = request.environ['CURRENT_USER']
    return 'Hello from bottle, %s' % str(user)

if __name__ == '__main__':
    run(host='127.0.0.1', app=app)