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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():
 # pragma: nocover """Return exit code of zero iff directory is not changed. """

    p = argparse.ArgumentParser()
    p.add_argument(
        'directory',
        help="Directory to check"
    )
    p.add_argument(
        '--verbose', '-v', action='store_true',
        help="increase verbosity"
    )
    args = p.parse_args()

    import sys
    _changed = changed(sys.argv[1], args=args)
    sys.exit(_changed)