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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def main(argv: Optional[Sequence[str]] = None) -> None: """ Start the pass-git-helper script. Args: argv: If not ``None``, use the provided command line arguments for parsing. Otherwise, extract them automatically. """

    args = parse_arguments(argv=argv)

    if args.logging:
        logging.basicConfig(level=logging.DEBUG)

    handle_skip()

    action = args.action
    request = parse_request()
    LOGGER.debug('Received action %s with request:\n%s',
                 action, request)

    try:
        mapping = parse_mapping(args.mapping)
    except Exception as error:
        LOGGER.critical('Unable to parse mapping file', exc_info=True)
        print(  # noqa: P101
            'Unable to parse mapping file: {error}'.format(
                error=error),
            file=sys.stderr)
        sys.exit(1)

    if action == 'get':
        get_password(request, mapping)
    else:
        LOGGER.info('Action %s is currently not supported', action)
        sys.exit(1)