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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 diff(**kwargs):
    '''
    Returns the difference between the candidate and the current configuration

    id : 0
        The rollback ID value (0-49)

    CLI Example:

    .. code-block:: bash

        salt 'device_name' junos.diff 3
    '''
    kwargs = salt.utils.args.clean_kwargs(**kwargs)
    id_ = kwargs.pop('id', 0)
    if kwargs:
        salt.utils.args.invalid_kwargs(kwargs)

    conn = __proxy__['junos.conn']()
    ret = {}
    ret['out'] = True
    try:
        ret['message'] = conn.cu.diff(rb_id=id_)
    except Exception as exception:
        ret['message'] = 'Could not get diff with error "{0}"'.format(
            exception)
        ret['out'] = False

    return ret