不管自然日，按交易日排序

好的，谢谢

我还有个问题，股价预测一般取多长时间的历史数据

如果你想根据过去的数据预测股价，很遗憾，你会失望的。就像机器学习和AI的大拿，Keras包的研发者 François Chollet所说的：

Trying to use machine learning to beat markets while only having access to publicly available data is a very difficult endeavor, and you are likely to waste your time and resources with nothing to show for it. Always remember that when it comes to markets, past performance is not a good predictor of future returns—looking in the rearview mirror is a bad way to drive.