@classmethod
def add_arguments(cls):
    """
        sub parser document
        """
    return [(('--skip-pkg',), dict(action='store_true', help=
        'skip install pkg')), (('--skip-pyenv',), dict(action='store_true',
        help='skip install pyenv')), (('--skip-user',), dict(action=
        'store_true', help='skip install user')), (('--skip-pypi',), dict(
        action='store_true', help='skip install pip package')), ((
        '--enable-node',), dict(action='store_true', help=
        'enable install node')), (('--parallel', '-P'), dict(action=
        'store_true', help='default to parallel execution method'))]
    pass
