new_contents: try:
      import cPickle as pickle
  except ImportError:
      import pickle
  
  
  class PickleSerializer:
      @staticmethod
      def dumps(obj):
          return pickle.dumps(obj, protocol=1)
  
      @staticmethod
      def loads(data):
          return pickle.loads(data)
  
  
  class RawSerializer:
      @staticmethod
      def dumps(obj):
          return obj
  
      @staticmethod
      def loads(data):
          return data
subject: introduce serializers