用memcache处理webpy的session

目前用的webpy0.34里没有对session提供memcache后端，自己参照其它的Store写了一个。

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import memcache as memcachefrom web.session import Storeclass MemcacheStore(Store):    def __init__(self, config):        '''        config = {        'servers': ['127.0.0.1:11211'],        'timeout': 1440        }        '''        self.mc = memcache.Client(config['servers'])        self.timeout = config['timeout']    def __contains__(self, key):        return True if self.mc.get(key) else False    def __getitem__(self, key):        return self.mc.get(key)    def __setitem__(self, key, value):        self.mc.set(key, value, self.timeout)    def __delitem__(self, key):        self.mc.delete(key)    def cleanup(self, timeout):        '''You need nothing to do. Memcache can handle it.'''        pass