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基于get_today_ticks 实现一个新的增量拉取的接口 get_today_ticks_incrementally。
由以前的一次全量拉取,改为可以实时增量拉取,对于需要实时更新数据的场景可提高数据获取速度,并且由于增量拉取使得每次拉取数据对sina页面访问次数低,可以实现高频增量更新数据而不会出现“HTTP Error 456”