Pandas：X 天组中的平均值

Question

我想以 10 天为一组（JAN/01 到 JAN/10）平均 AAPL.High 的值，使用第 10 天作为参考号。

import pandas as pd
df = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/finance-charts-apple.csv')

代码的思想大概是：

df1['demand'] = df1.groupby(['supplier_name', 'date'])['difference'].transform('mean').fillna(0)

Answer 1

将索引定义为日期的简单案例，然后只需使用resample()

import pandas as pd
df = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/finance-charts-apple.csv')
df.index = pd.to_datetime(df["Date"])
df.resample("10d").agg({"AAPL.High":np.mean})

output

            AAPL.High
Date    
2015-02-17  130.657501
2015-02-27  129.675001
2015-03-09  126.661251
2015-03-19  127.134283
2015-03-29  126.533333
... ...
2017-01-07  119.532001
2017-01-17  120.841248
2017-01-27  125.740000
2017-02-06  133.172500
2017-02-16  135.899994