memoizer decorator with memcache

MemcacheHelper.py

import memcache
import hashlib

client = None

def getClient() :
    global client
    if not client :
        client = memcache.Client(['127.0.0.1:11211'], debug=0)
    return client

def generateMemcacheKey(args, kwargs) :
    margs = [x.__repr__() for x in args]
    mkwargs = [x.__repr__() for x in kwargs.values()]
    m = hashlib.md5()
    map(m.update, margs + mkwargs)
    return m.hexdigest()

def memcachememoize(f):
    def memcache_memoized_function(*args, **kwargs):
        hexdigest = generateMemcacheKey(args, kwargs)
        key = f.__class__.__name__ + '.' + f.__name__ + '(' + hexdigest + ')' 
        if not getClient().add(key, 1) :
            return getClient().get(key)
        else :
            value = f(*args, **kwargs)
            getClient().set(key, value)
            return value
    return memcache_memoized_function