def follower(platform, **kwargs):
    """用于生成特定的券商对象
    :param platform:平台支持 ['jq', 'joinquant', '聚宽’]
    :param initial_assets: [雪球参数] 控制雪球初始资金，默认为一万,
        总资金由 initial_assets * 组合当前净值 得出
    :param total_assets: [雪球参数] 控制雪球总资金，无默认值,
        若设置则覆盖 initial_assets
    :return the class of follower

    Usage::

        >>> import easytrader
        >>> user = easytrader.use('xq')
        >>> user.prepare('xq.json')
        >>> jq = easytrader.follower('jq')
        >>> jq.login(user='username', password='password')
        >>> jq.follow(users=user, strategies=['strategies_link'])
    """
    if platform.lower() in ["rq", "ricequant", "米筐"]:
        return RiceQuantFollower()
    if platform.lower() in ["jq", "joinquant", "聚宽"]:
        return JoinQuantFollower()
    if platform.lower() in ["xq", "xueqiu", "雪球"]:
        return XueQiuFollower(**kwargs)
    raise NotImplementedError