高级语言程序设计-Python实验报告三

import time

nowTime = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(time.time()))

f1 = open("./lasttime.txt", "w+")
f1.write(nowTime + "\n")

f2 = open("./eachtime.txt", "a+")
f2.write(nowTime + "\n")

print("本次运行的时间：", nowTime, "\n")

f1.seek(0)
print("文件lasttime.txt的内容：")
for line in f1:
    print(line)
f1.close()

f2.seek(0)
print("文件eachtime.txt的内容：")
for line in f2:
    print(line)
f2.close()

from PIL import Image

im = Image.open("./test.png")
imageSize = im.size
print("原始图片大小：", imageSize)

im.thumbnail((imageSize[0] / 10, imageSize[1] / 10))
print("缩小后的图片大小：", im.size)
im.save("thumbnail.jpg")

from PIL import Image

im = Image.open("./test.png")

im1 = im.rotate(30)
im1.save("./rotate.png")

from PIL import Image

im = Image.open("./test.png")
r, g, b = im.split()
newg = g.point(lambda i: i * 0.5 if i < 100 else i * 2)

om = Image.merge("RGB", (r, newg, b))

g.save("green.png")

om.save("ChangePoint.png")

import json
import os.path

filename = "studentsInfo.txt"


def menu():
    print("\n==================学生信息管理系统==============")
    print("\t\t1. 添加学生信息")
    print("\t\t2. 修改学生信息")
    print("\t\t3. 显示所有学生信息")
    print("\t\t4. 保存数据")
    print("\t\t0. 退出程序")
    print("================================================")


def insert():
    id = input("请输入ID：")
    name = input("请输入姓名：")
    birthday = int(input("请输入生日："))
    # 将录入的学生信息保存在字典中
    student = {
        "id": id,
        "name": name,
        "birthday": birthday,
    }
    # 将学生信息添加到列表中
    # student_list.append(student)
    save(str(student))
    print("学生信息保存成功")


def modify():
    show()

    with open(filename, "r", encoding="utf-8") as file:
        student_old = file.readlines()

    student_id = input("请输入修改学生的ID：")
    with open(filename, "w", encoding="utf-8") as wfile:
        studentInfo = []
        for item in student_old:
            d = dict(eval(item))
            if d["id"] == student_id:
                print("已经找到学生信息，请修改相关信息")
                d["name"] = input("请输入姓名")
                d["birthday"] = input("请输入生日")
                wfile.write(str(d) + "\n")
                print("修改成功")
            else:
                wfile.write(str(d) + "\n")


def save(data):
    try:
        stu_txt = open(filename, "a", encoding="utf-8")
    except:
        stu_txt = open(filename, "w", encoding="utf-8")
    stu_txt.write(data + "\n")
    stu_txt.close()


def show():
    with open(filename, "r", encoding="utf-8") as file:
        list = []
        student = file.readlines()
        for item in student:
            d = dict(eval(item))
            list.append(d)
    print(json.dumps(list, sort_keys=False, indent=4))


if __name__ == "__main__":
    while True:
        menu()
        choice = int(input("请选择功能："))
        if choice in [0, 1, 2, 3, 4]:
            if choice == 0:
                break
            elif choice == 1:
                insert()
            elif choice == 2:
                modify()
            elif choice == 3:
                show()
            elif choice == 4:
                print("数据位于studentsInfo.txt")