code: def append_to_comma_separated_list(
      conf: pyspark.SparkConf, k: str, *new_values: str
  ):
      old = conf.get(k, None)
      if old is None:
          conf.set(k, ",".join(new_values))
      else:
          conf.set(k, old + "," + ",".join(new_values))
  
imports: import sys
  import os
  import pyspark
  import pyspark.sql
  import orjson
  from typing import Optional
  from hail.expr.table_type import ttable
  from hail.fs.hadoop_fs import HadoopFS
  from hail.ir.renderer import CSERenderer
  from hail.table import Table
  from hailtop.aiotools.router_fs import RouterAsyncFS
  from hailtop.aiotools.validators import validate_file
  from .py4j_backend import Py4JBackend
  from .backend import local_jar_information
label_desc: Use image node_id 1 for calling a global function with example usage: append_to_comma_separated_list(conf, k) without return types