<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _run_main(main, argv):
 """Calls main, optionally with pdb or profiler."""

  if FLAGS.run_with_pdb:
    sys.exit(pdb.runcall(main, argv))
  elif FLAGS.run_with_profiling or FLAGS.profile_file:
    # Avoid import overhead since most apps (including performance-sensitive
    # ones) won't be run with profiling.
    import atexit
    if FLAGS.use_cprofile_for_profiling:
      import cProfile as profile
    else:
      import profile
    profiler = profile.Profile()
    if FLAGS.profile_file:
      atexit.register(profiler.dump_stats, FLAGS.profile_file)
    else:
      atexit.register(profiler.print_stats)
    retval = profiler.runcall(main, argv)
    sys.exit(retval)
  else:
    sys.exit(main(argv))