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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def make_request_fn():
 """Returns a request function."""

  if FLAGS.cloud_mlengine_model_name:
    request_fn = serving_utils.make_cloud_mlengine_request_fn(
        credentials=GoogleCredentials.get_application_default(),
        model_name=FLAGS.cloud_mlengine_model_name,
        version=FLAGS.cloud_mlengine_model_version)
  else:

    request_fn = serving_utils.make_grpc_request_fn(
        servable_name=FLAGS.servable_name,
        server=FLAGS.server,
        timeout_secs=FLAGS.timeout_secs)
  return request_fn