code: def __create_user_default_attr_prop(self, extra_info):
          
          p = UserDefaultAttrProp()
  
          doc = extra_info.pop('doc', None)
          if doc is not None:
              extra_info['description'] = doc
  
          for k, v in extra_info.items():
              k_lower = k.lower()
              method_name = "set_%s" % k_lower.replace(' ', '_')
              if hasattr(p, method_name):
                  method = getattr(p, method_name)
                  if method_name == 'set_enum_labels':
                      method(v)
                  else:
                      method(str(v))
              elif k == 'delta_time':
                  p.set_delta_t(str(v))
              elif k_lower not in ('display level', 'polling period', 'memorized'):
                  msg = "Wrong definition of attribute. " \
                        "The object extra information '%s' " \
                        "is not recognized!" % (k,)
                  Except.throw_exception("PyDs_WrongAttributeDefinition", msg,
                                         "create_user_default_attr_prop()")
          return p
docs: for internal usage only