学生管理系统（包含计算平均年龄）

import time
#
def print_info():
    print("=" * 30)
    print("欢迎使用学生管理系统")
    print("1. 添加学生信息")
    print("2. 修改学生信息")
    print("3. 删除学生信息")
    print("4. 查询学生信息")
    print("5. 计算平均年龄")
    print("6. 退出系统")
    print("=" * 30)


def add_student():  # 添加学生信息
    global student_info  # 声明函数中要修改的是全局变量student_info
    dict_1 = {}
    name = input("请输入学生的姓名：")
    age = int(input("请输入学生的年龄："))
    sex = input("请输入学生的性别：")
    id = input("请输入学生的号码：")
    dict_1["name"] = name  # 通过key添加value
    dict_1["age"] = age
    dict_1["sex"] = sex
    dict_1["id"] = id
    student_infor.append(dict_1)  # 将字典追加到列表的一个元素


# student_infor = [{'name': 'zhangsna ', 'age': '20', 'sex': 'nv', 'id': '123456y'}]


def alter_student():
    list_2= []
    opp_name = input("请输入要删除的学生姓名")
    for i in student_infor:
        for k, v in i.items():
            if k == 'name':
                list_2.append({k: v})
    num_3 = list_2.index({"name": opp_name})


    # global student_infor
    name = input("请输入新的学生的姓名：")
    if len(name) > 0:
        student_infor[num_3]["name"] = name
    age = input("请输入新的年龄")
    if len(age) > 0:
        student_infor[num_3]["age"] = age
    id = input("请输入新的id")
    if len(id) > 0:
        student_infor[num_3]["id"] = id
    sex = input("请输入新的性别")
    if len(sex) > 0:
        student_infor[num_3]["sex"] = sex


def opp_student():
    list_2 = []
    opp_name = input("请输入要删除的学生姓名")
    for i in student_infor:
        for k, v in i.items():
            if k == 'name':
                list_2.append({k: v})
    num_3 = list_2.index({"name": opp_name})
    # global student_infor
    del student_infor[num_3]


def show_student():  # 显示学生信息
    num_1=  input("根据序号查询还是根据姓名查询（0根据序号，1根据姓名，2显示所有）")
    if num_1 == "1":
        list_2 = []
        new_name = input("请输入要查查询的学生姓名")
        for i in student_infor:
            for k, v in i.items():
                if k == 'name':
                    list_2.append({k: v})
        num_3 = list_2.index({"name": new_name})
        print(student_infor[num_3])



    elif num_1 == "0":
        show_num = int(input("请输入您要查询的学生序号：(0代表查询所有的学生信息)"))
        if show_num != 0:
            for i, j in student_infor[show_num - 1].items():
                print(i, j)
        elif show_num == 0:

            for temp in student_infor:  # 遍历列表
                m = 1  # 索引
                for x, y in temp.items():
                    print(m, x, y)
                    m += 1
            time.sleep(2)
    elif num_1 == "2":
        print(student_infor)
    else:
        print("输入错误")

def age_1():
    m = 0
    n = 0
    for i in student_infor:
        for v in i.values():
            if type(v) == int:
                # print(v)
                m += v
                n += 1

    print(m / n)


student_infor = []


while True:
    print_info()
    choise = int(input('请输入您要选择的操作：（1~5）'))
    if choise in [1, 2, 3, 4, 5, 6]:
        print("您选择的操作是", choise)
        if choise == 6:
            print("感谢使用该程序")
            num_1 = input("您确定要退出程序吗：(y/n)")
            if num_1 == "y":
                break
            elif num_1 == "n":
                continue
        elif choise == 1:
            print("您选择的操作是1")
            add_student()
            print(student_infor)
        elif choise == 2:
            print("您选择的操作是修改学生信息")
            alter_student()
            print(student_infor)
        elif choise == 3:
            print("您选择的操作是删除学生信息")
            opp_student()
        elif choise == 4:
            print("您选择的操做是查看学生信息")
            show_student()

        elif choise == 5:
            print("您选择的是计算平均年龄")
            age_1()

    else:
        print("输入有误请重新输入")