text: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  #
  # Copyright (c) 2015 Baidu, Inc. All Rights Reserved.
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  #
  
  """
  Some common functions shared by Bigflow transforms
  
  Author: Wang, Cong(bigflow-opensource@baidu.com)
  """
  
  
  def default_key_extractor(x):
      return x[0]
  
  
  def default_value_extractor(x):
      return x[1] if len(x) == 2 else x[1:]
  
  