code: def _set_merge_parser(_parsers):
      """
      config merge parser
      """
  
      merge_parser = _parsers.add_parser(
          "merge", help="merge with another yaml file"
      )
  
      _set_merge_parser_arg(merge_parser)
      _set_update_parser_arg(merge_parser)
  
      merge_parser.set_defaults(
          function=merge_yaml, tips=merge_parser.format_help()
      )
  
imports: import sys
  import argparse
  from argparse import Namespace
  import os, shutil
  import getopt
  from ruamel.yaml import YAML, yaml_object
  from ruamel.yaml.comments import CommentedSeq, CommentedMap
  from ruamel.yaml.tokens import CommentToken
label_desc: Use image node_id 21 for calling a global function with example usage: _set_merge_parser(_parsers) without return types