webpy save session to redis

import redis
import web

SESSION = 'SESSION:'

class RedisStore(web.session.Store):

    """Store for saving a session in redis: import rediswebpy session = web.session.Session(app, rediswebpy.RedisStore(), initializer={'count': 0}) """
    def __init__(self, ip='localhost', port=6379, db=0, initial_flush=False):
        self.redis_server = redis.Redis(ip, port, db)
        if initial_flush:
            """ flushing the database is very important when you update your Session object initializer dictionary argument. E.g. # Before Update: session = web.session.Session(app, rediswebpy.RedisStore(initial_flush=True), initializer={'a':1}) # After Update: session = web.session.Session(app, rediswebpy.RedisStore(initial_flush=True), initializer={'a':1, 'b':2}) # This will cause an error if initial_flush=False since existing # sessions in Redis will not contain the key 'b'. """
            self.redis_server.flushdb()

    def __contains__(self, key):
        # test if session exists for given key
        return bool(self.redis_server.get(SESSION+key))

    def __getitem__(self, key):
        # attempt to get session data from redis store for given key
        data = self.redis_server.get(SESSION+key)
        # if the session existed for the given key
        if data:
            # update the expiration time
            self.redis_server.expire(SESSION+key,
                                     web.webapi.config.session_parameters.timeout)
            return self.decode(data)
        else:
            raise KeyError

    def __setitem__(self, key, value):
        # set the redis value for given key to the encoded value, and reset the
        # expiration time
        self.redis_server.set(SESSION+key,
                              self.encode(value))
        self.redis_server.expire(SESSION+key,
                                     web.webapi.config.session_parameters.timeout)

    def __delitem__(self, key):
        self.redis_server.delete(SESSION+key)

    def cleanup(self, timeout):
        # since redis takes care of expiration for us, we don't need to do any
        # clean up
        pass
import web
import memcache

class MemCacheStore(web.session.Store):
    mc = None
    def __init__(self):
        self.mc = memcache.Client(['127.0.0.1:11211'], debug=0)
    def __contains__(self, key):
        return self.mc.get(key) != None
    def __getitem__(self, key):
        return self.mc.get(key)
    def __setitem__(self, key, value):
        self.mc.set(key, value, time = web.config.session_parameters["timeout"])
    def __delitem__(self, key):
        self.mc.delete(key)
    def cleanup(self, timeout):
        pass # Not needed as we assigned the timeout to memcache

web.config.debug = False
urls = (
    "/count", "count",
    "/reset", "reset"
)

app = web.application(urls, locals())
session = web.session.Session(app, MemCacheStore(), initializer={'count': 0})

class count:
    def GET(self):
        session.count += 1
        return str(session.count)

class reset:
    def GET(self):
        session.kill()
        return ""

if __name__ == "__main__":
    app.run()