python 常用函数（zip，sys.stout,dt.year,np.cumsum(),np.median(),count(),value_counts(),size()）

zip:https://www.runoob.com/python3/python3-func-zip.html

sys.stout:  https://www.cnblogs.com/keye/p/7859181.html

3.dt.year

标准时间中选取年，月日类似

4.value_counts()计数

5.dropna()函数

https://blog.csdn.net/weixin_40283816/article/details/84304055

6.fillna()函数

https://blog.csdn.net/weixin_39549734/article/details/81221276

7.cumsum()函数

https://www.jianshu.com/p/23e7e9251abb

 

8.np.median()函数

https://www.jb51.net/article/137622.htm

 

9.count(),value_counts(),size()

https://blog.csdn.net/qq_20412595/article/details/79921849

10.68个函数详解

https://blog.csdn.net/lifanping/article/details/78501812