code: def _backup(in_file_p):
      backup_p = in_file_p + ".bak"
  
      if os.path.exists(backup_p):
          os.remove(backup_p)
  
      if not os.path.exists(in_file_p):
          print("File {} not exists.".format(in_file_p))
          sys.exit(1)
  
      shutil.copyfile(in_file_p, backup_p)
  
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 13 for calling a global function with example usage: _backup(in_file_p) without return types