code: def follower(platform, **kwargs):
      
      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
docs: 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'])