code: def get_serializer(serializer):
      
      if isinstance(serializer, string_types):
          try:
              app_label, serializer_name = serializer.split('.')
              app_package = get_application(app_label)
              serializer_module = import_module('%s.serializers' % app_package)
              serializer = getattr(serializer_module, serializer_name)
          except Exception as e:
              logger.error('Serializer %s not found: %s' % (serializer, e))
              return None
      return serializer
docs: Load a serializer.