code: def get(self, key, **kw):
          
          return self.impl.get(key, **self._get_cache_kw(kw, None))
docs: Retrieve a value from the cache.
  
          :param key: the value's key.
          :param \**kw: cache configuration arguments.  The
           backend is configured using these arguments upon first request.
           Subsequent requests that use the same series of configuration
           values will use that same backend.