我是python新手，正在研究一个数据框架，它的第一列是"Country"，后面是144列数字数据.
Goal and Expected Result:
需要创建平均为3列的新列.例:第一个新列是前三列数值数据(列号1、2和3)的平均值.下一个新列是后续3列(列编号4、5和6)的平均值，依此类推.由于此数据集有144列，我们需要创建48个新列(144/3).请在下面找到数据帧的快照
我正在使用下面的代码，这绝对不是一种理想的方法，应该有更好的方法.
是否有人可以建议是否可以使用循环函数实现输出？
df = pd.read_excel('/content/df_Data.xlsx')
df[2010_1] = df[[1,2,3]].mean(axis=1)
df[2010_2] = df[[4,5,6]].mean(axis=1)
df[2010_3] = df[[7,8,9]].mean(axis=1)
df[2010_4] = df[[10,11,12]].mean(axis=1)
df[2011_1] = df[[13,14,15]].mean(axis=1)
df[2011_2] = df[[16,17,18]].mean(axis=1)
df[2011_3] = df[[19,20,21]].mean(axis=1)
df[2011_4] = df[[22,23,24]].mean(axis=1)
df[2012_1] = df[[25,26,27]].mean(axis=1)
df[2012_2] = df[[28,29,30]].mean(axis=1)
df[2012_3] = df[[31,32,33]].mean(axis=1)
df[2012_4] = df[[34,35,36]].mean(axis=1)
df[2013_1] = df[[37,38,39]].mean(axis=1)
df[2013_2] = df[[40,41,42]].mean(axis=1)
df[2013_3] = df[[43,44,45]].mean(axis=1)
df[2013_4] = df[[46,47,48]].mean(axis=1)
df[2014_1] = df[[49,50,51]].mean(axis=1)
df[2014_2] = df[[52,53,54]].mean(axis=1)
df[2014_3] = df[[55,56,57]].mean(axis=1)
df[2014_4] = df[[58,59,60]].mean(axis=1)
df[2015_1] = df[[61,62,63]].mean(axis=1)
df[2015_2] = df[[64,65,66]].mean(axis=1)
df[2015_3] = df[[67,68,69]].mean(axis=1)
df[2015_4] = df[[70,71,72]].mean(axis=1)
df[2016_1] = df[[73,74,75]].mean(axis=1)
df[2016_2] = df[[76,77,78]].mean(axis=1)
df[2016_3] = df[[79,80,81]].mean(axis=1)
df[2016_4] = df[[82,83,84]].mean(axis=1)
df[2017_1] = df[[85,86,87]].mean(axis=1)
df[2017_2] = df[[88,89,90]].mean(axis=1)
df[2017_3] = df[[91,92,93]].mean(axis=1)
df[2017_4] = df[[94,95,96]].mean(axis=1)
df[2018_1] = df[[97,98,99]].mean(axis=1)
df[2018_2] = df[[100,101,102]].mean(axis=1)
df[2018_3] = df[[103,104,105]].mean(axis=1)
df[2018_4] = df[[106,107,108]].mean(axis=1)
df[2019_1] = df[[109,110,111]].mean(axis=1)
df[2019_2] = df[[112,113,114]].mean(axis=1)
df[2019_3] = df[[115,116,117]].mean(axis=1)
df[2019_4] = df[[118,119,120]].mean(axis=1)
df[2020_1] = df[[121,122,123]].mean(axis=1)
df[2020_2] = df[[124,125,126]].mean(axis=1)
df[2020_3] = df[[127,128,129]].mean(axis=1)
df[2020_4] = df[[130,131,132]].mean(axis=1)
df[2021_1] = df[[133,134,135]].mean(axis=1)
df[2021_2] = df[[136,137,138]].mean(axis=1)
df[2021_3] = df[[139,140,141]].mean(axis=1)
df[2021_4] = df[[142,143,144]].mean(axis=1)
