p013_compute_max_min_avg.py

代码：

student_grade_input.txt

101,刘晨曦,88
102,王雨轩,98
103,王祎伟,90
104,李威,70
105,景少帅,99
106,周泽宇,96

　p013_compute_max_min_avg.py　

def compute_score():
    scores=[]
    with open("./student_grade_input.txt") as fin:
        for line in fin:
            line=line[:-1]#mov /n
            fields=line.split(",")
            scores.append(int(fields[-1]))
    print(scores)
    max_score=max(scores)

    min_score=min(scores)
    avg_score=round(sum(scores)/len(scores),2)
    return max_score,min_score,avg_score

max_score,min_score,avg_score=compute_score()
print(f"max_score={max_score},min_score={min_score},avg_score={avg_score}")

效果：

[88, 98, 90, 70, 99, 96]
max_score=99,min_score=70,avg_score=90.17

总结：

1. 首先读取文件用with open 路径 as fin:把文件的内容读取出来存入变量fin里面，用with命令可以保证文件内容关闭后保存；
2. line=line[:-1]把行号去掉，fields=line.split(",")，把每行里面加入逗号分隔，然后存入fields变量中；
3. scores.append(int(fields[-1]))，把最后一列加入列表中。