code: def __str__(self) -> str:
      return "%s(%s)" % (
          type(self).__name__,
          ", ".join("%s=%s" % item for item in vars(self).items()),
      )
  
imports: from __future__ import annotations
  from typing import Dict, List
  from evadb.constants import UNDEFINED_GROUP_ID
  from evadb.optimizer.group_expression import GroupExpression
  from evadb.optimizer.property import Property
  from evadb.utils.logging_manager import logger
label_desc: Use image node_id 8 for calling the Group obj's underlying member method code with example usage: obj.__str__() and returns: unknown