code: def _get_value_specs(cls, cls_in, attribute_name):
          
  
          if cls_in in {dict, list}:
              return ValueSpecs(None, ValueTypes(None, None))
          else:
              return cls._fetch_attribute_specs_from_doc(cls_in, attribute_name)
docs: :type cls_in: type
          :type attribute_name: str
  
          :rtype: ValueSpecs