code: def repr_class_data(self, class_data):
          
          if "subclass" in class_data:
              for subclass_data in class_data["subclass"]:
                  self.repr_class_data(subclass_data)
          self.repr_def_class(class_data)
          self.repr_setattr(class_data)
docs: Create code like this::
          
              class Person(classtree.Base):
                  def __init__(self, name=None, person_id=None):
                      self.name = name
                      self.person_id = person_id
              
              
              class PersonCollection(classtree.Base):
                  def __init__(self, collection_id=None, create_date=None, name=None):
                      self.collection_id = collection_id
                      self.create_date = create_date
                      self.name = name
              
                      person = Person(name='Jack', person_id=1)
                      self.name____Jack = person
                      self.person_id____1 = person
                      
                      person = Person(name='Paul', person_id=2)
                      self.name____Paul = person
                      self.person_id____2 = person