code: def main(argv=None):
      parser = argparse.ArgumentParser()
  
      subparsers = parser.add_subparsers(required=True)
      combine_parser = subparsers.add_parser(
          "combine",
          help="Combine all Python files into a single unified `portalocker.py` "
          "file for easy distribution",
      )
      combine_parser.add_argument(
          "--output-file",
          "-o",
          type=argparse.FileType("w"),
          default=str(_default_output_path),
      )
  
      combine_parser.set_defaults(func=combine)
      args = parser.parse_args(argv)
      args.func(args)
  
file_path: catboost/contrib/python/portalocker/py3/portalocker/__main__.py
imports: import argparse
  import logging
  import os
  import pathlib
  import re
label_desc: Use image node_id 1 for calling a global function with example usage: main(argv) without return types