weixin_43124630的博客

代码与图import pandas as pdimport numpy as npimport matplotlib.pyplot as plt# 可视化必不可少的套件matplotlib# plot data # Series # 生成1000个数据data = pd.Series(np.random.randn(1000), index=np.arange(1000))...

都在代码中import numpy as npimport pandas as pd# merging two df by key/keys. (may be used in database)# simple exampleleft = pd.DataFrame({'key':['K0', 'K1', 'K2', 'k3'], 'A':['...

代码与注释如下import pandas as pdimport numpy as npdates = pd.date_range('20191218', periods=6)df = pd.DataFrame(np.arange(24).reshape((6,4)), index=dates, columns=['A', 'B', 'C', 'D'])print(df)df.i...