code: def describe(self):
          
          return OrderedDict([
              (name, field.describe())
              for name, field in self.fields.items()
          ])
docs: Describe all serialized fields.
  
          It returns dictionary of all fields description defined for this
          serializer using their own ``describe()`` methods with respect to order
          in which they are defined as class attributes.
  
          Returns:
              OrderedDict: serializer description