code: def memcached_client(servers=config.memcached_uri, debug=config.debug_memcache):
      
      key = None
      try:
          client, key = scoped_instance_manager.acquire(servers, debug=debug)
          yield client
      finally:
          if key:
              scoped_instance_manager.release(key)
docs: Get a shared memcached instance.
  
      This function shares the same memcached instance across nested invocations.
      This is done so that memcached connections can be kept to a minimum, but at
      the same time unnecessary extra reconnections are avoided. Typically an
      initial scope (using 'with' construct) is made around parts of code that hit
      the cache server many times - such as a resolve, or executing a context. On
      exit of the topmost scope, the memcached client is disconnected.
  
      Returns:
          `Client`: Memcached instance.