Python练习作业3

我什么都学不会2026-01-31 17:25

python 复制代码

# 1
import os

path = "./05python-io"  

def find_al_files(p):
    for f in os.listdir(p):
        fp = os.path.join(p, f)
        if os.path.isfile(fp):
            print(fp)
        else:
            find_al_files(fp)

find_al_files(path)

测试结果：

python 复制代码

# 2
username = input("注册用户名：")
password = input("注册密码：")
with open("user.txt", "a") as f:
    f.write(f"{username},{password}\n")

login_username = input("登录用户名：")
login_password = input("登录密码：")
success = False

with open("user.txt", "r") as f:
    for line in f:
        u, p = line.strip().split(",")
        if u == login_username and p == login_password:
            success = True

print("登录成功" if success else "失败")

测试结果：

python 复制代码

# 3
# 录入3个学生
s1 = input("输入学号、姓名、年龄、成绩（用逗号分隔）：").split(",")
s2 = input("输入第二个学生：").split(",")
s3 = input("输入第三个学生：").split(",")

# 转为列表（成绩用于排序）
students = [
    [s1[0], s1[1], s1[2], float(s1[3])],
    [s2[0], s2[1], s2[2], float(s2[3])],
    [s3[0], s3[1], s3[2], float(s3[3])]
]

# 按成绩降序排序
students.sort(key=lambda x: x[3], reverse=True)

print("排序后：")
for s in students:
    print(f"学号：{s[0]}, 姓名：{s[1]}, 成绩：{s[3]}")

测试结果：