一个关于Python文件部分的题

大概就是图片里面的题目，因为这节课我缺了，所以关于文件的实在不会，希望能给解答一下，最好能有注释，没有也没关系

有用请采纳

def getScore(fileName):         # 传入文件路径
    with open(fileName, 'r', encoding='utf-8') as f:
        scores = f.readlines()

    scores = [float(each) for each in scores]      # 将字符转变为数
    maxScore, minScore, allScore = -1, 11, 0        # 记录最大最小分以及总分
    
    for each in scores:
        allScore += each
        if each > maxScore:
            maxScore = each

        if each < minScore:
            minScore = each

    print("平均分:{:.2f}".format((allScore - maxScore - minScore) / 8))


getScore('score.txt')