python实现学生管理系统（最简版）

def print_menue():
    print("----------")
    print("学生管理系统")
    print("1:添加学生")
    print("2:删除学生")
    print("3:修改学生")
    print("4:查询学生")
    print("5:显示所有学生")
    print("6:退出系统")
    print("-----------")


# 列表存储多个学生字典
student_info = [{"name": "gcl", "tel": "110", "QQ": "250"}]
# 字典存储一个学生信息
student_message = {}


def add_info():
    name = input("输入姓名：")
    tel = input("输入电话：")
    qq = input("输入QQ号：")
    global student_message
    student_message["name"] = name
    student_message["tel"] = tel
    student_message["QQ"] = qq
    global student_info
    # 查重
    for i in student_info:
        # 通过i取出列表中的每个元素
        if i["name"] == name and i["tel"] == tel:
            print("信息重复!")
            return
    # 将信息添加到列表中
    student_info.append(student_message)
    print("添加成功！")


def search_info():
    name = input("输入姓名：")
    flag = 0
    for i in student_info:
        if i["name"] == name:
            print("name:", i["name"])
            print("tel:", i["tel"])
            print("QQ:", i["QQ"])
            flag = 1
        if flag == 0:
            print("未查询到相关信息！")


def del_info():
    name = input("输入待删除人姓名：")
    tel = input("输入待删除人电话号码：")
    # for-else用法
    for i in student_info:
        if i["name"] == name and i["tel"] == tel:
            # remove是按照值删除
            student_info.remove(i)
            break
    # 此处的else和for对应使用
    # for循环使用break退出后就不执行else了
    else:
        print("未查询到对应学员！")


def modifty_info():
    name = input("输入姓名：")
    tel = input("输入电话号码：")
    flag = 0
    for i in student_info:
        # 因为地址一样所以可以牵连列表内数据一起改动。
        if i["name"] == name and i["tel"] == tel:
            name = input("输入修改后的姓名：")
            tel = input("输入修改后的电话号码：")
            i["name"] = name
            i["tel"] = tel
            print("修改成功")
            break
    else :
        print("查无此人！")


def print_all_info():
    for i in student_info:
        print("name  tel  QQ")
        print("%s  %s  %s" % (i["name"], i["tel"], i["QQ"]))


def main():
    # 程序入口
    while True:
        print_menue()
        num = int(input("输入需要的功能:"))
        if num == 1:
            add_info()
        elif num == 2:
            del_info()
        elif num == 3:
            modifty_info()
        elif num == 4:
            search_info()
        elif num == 5:
            print_all_info()
        elif num == 6:
            print("再见！")
            break
        else:
            print("输入错误")
        input("~~~~输入回车继续~~~~")


# 程序开始
main()