gistfile1.py

def cache_method(name):
  def dict_cache_wrapper(fn):
    cache = {}

    def wrapper(*args):
      if args not in cache:
        cache[args] = fn(*args)

      return cache[args]

    return wrapper

  def memcached_wrapper(fn):
    def wrapper(*args):
      return fn(*args)

    return wrapper

  if name == 'memory':
    return dict_cache_wrapper
  elif name == 'memcached':
    return memcached_wrapper
  else:
    raise Exception

@cache_method("memory")
def lookup(key):
  return key

lookup("hello")