code: def format(self, obj):
      if isinstance(obj, dict):
          return self.format(
              ["{}={}".format(k, v) for k, v in obj.items()]
          )
      if isinstance(obj, list):
          return self.format(",".join(obj))
      return str(obj).format(**self.vars)
  
label_desc: Use image node_id 4 for calling the ClusterConfig obj's underlying member method code with example usage: obj.format(obj) and returns: str, self, self