群答疑随手记：文本文件中保存了学生多次测试的成绩。每个学生每次测试成绩占一行，某行数据如：0001 小明 95 请统计每个学生的平均分。

import csv
rows3 = ['Num', 'Name', 'Avg_grade']
f = open("../source/result.csv", 'a', newline='', encoding='utf-8')
writer = csv.writer(f)
writer.writerow(rows3)
f.close()
f = open("../source/stu_score.txt",'r', encoding='gbk')
score = []
num = []
name = []
score_m = 0
count = 0
for line in f:
    score.append(line.split()[2].strip())
    num.append(line.split()[0].strip())
    name.append(line.split()[1].strip())
f.close()
num_del = list(set(num))
for i in num_del:
    for j in num:
        if i==j:
            index = [p for p,v in enumerate(num) if v ==j]
            h_name = name[num.index(j)]
            break
    count = len(index)
    for m in index:
        score_m = score_m + int(score[m])
    avg = score_m/count
    print("学号为:",i,"的学生",h_name,"平均成绩为：",avg)
    rows3 = [i, h_name, avg]
    f = open("../source/result.csv", 'a', newline='',encoding='utf-8')
    writer = csv.writer(f)
    writer.writerow(rows3)
    f.close()
    count = 0
    score_m = 0
    avg = 0