表格内容大致如下： 一共两列（Year | SIF ）Year:2001 -2020
目的：求每一年对应的SIF 平均值
1 import pandas as pd 2 import numpy as np 3 4 file = pd.read_csv('csv存放路径') 5 a = [] 6 7 for year in range(2001,2021): 8 sif = file[['SIF']][file['Year'] == year] 9 mean_sif = np.average(sif) # 一年sif平均 10 a.append(mean_sif) # 将每一年的平均值放在一个数组里面 11 12 # 新建csv 13 name = ['mean_sif'] 14 new_file = pd.DataFrame(cloumns = name, data = a) 15 new_file.to_csv('新的csv存放地址',encoding = 'gbk')