习题答案参考来源:https://blog.youkuaiyun.com/qq_43654994/article/details/105882917
https://blog.youkuaiyun.com/KF_Guan/article/details/105879341
部分代码:
import numpy as np
import pandas as pd
一、2002 年-2018 年上海机动车拍照拍卖
df = pd.read_csv('数据集/2002年-2018年上海机动车拍照拍卖.csv')
df.head()
(1) 哪一次拍卖的中标率首次小于5%
df['rate']=df['Total number of license issued']/df['Total number of applicants']
df.query('rate <0.05').iloc[0]
(2) 按年统计拍卖最低价的下列统计量:最大值、均值、0.75 分位数,要求显示在同一张表上
df['Month']=df['Date']
df['Year']=df['Date']
df['Month']=df['Month'].agg(lambda x:x[-3:])
df['Year']=df['Year'].agg(lambda x:'200'+x[:-4] if len(x)<6 else '20'+x[:-4])
df.groupby(['Year'])['lowest price '].agg(['max','mean',('0.75'