code: def __init__(self, lookup_address: Union[List[str], str]):
      if isinstance(lookup_address, str):
          lookup_address = lookup_address.split(",")
      self._supervisors = [n.strip() for n in lookup_address]
  
imports: from typing import AsyncGenerator, List, Optional, Union
  from ..core import NodeRole
  from .base import AbstractClusterBackend, register_cluster_backend
label_desc: Use image node_id 1 to create a new FixedClusterBackend object from inherited base classes: AbstractClusterBackend with example: obj = FixedClusterBackend(lookup_address)