09-pandas多层索引切片

import numpy as np
import pandas as pd
index=[("beijing",2007),("beijing", 2017),
       ("beijing", 2027),("shenzhen",2007),
       ("shenzhen",2017),("shenzhen",2027)]
money=np.random.rand(6)
Mindex=pd.MultiIndex.from_tuples(index)
city=pd.DataFrame(money,index=Mindex)
print(city)

index=[(2007,"beijing"),(2017,"beijing"),
       (2027,"beijing"),(2007,"shenzhen"),
       (2017,"shenzhen"),(2027,"shenzhen")]
Mindex2=pd.MultiIndex.from_tuples(index)
print(city.reindex(Mindex2))#重构但是city不变

print(city.loc["beijing"])#取出某一个索引
print(city.iloc[0])#取出某一行
print(city.loc[["beijing","shenzhen"]])#切片
print(city.iloc[0:4])#取出0-4切片
print(city.loc[["beijing","shenzhen"]].iloc[0:3])#切片