以面向学生的方式的学生管理系统

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class Student(object):

    def __init__(self, xuehao, name, banji, phone, rxcj):
        self.xuehao = xuehao
        self.name = name
        self.banji = banji
        self.phone = phone
        self.rxcj = rxcj


class MySystem(object):

    def __init__(self):
        self.card_infors = []

    def print_menu(self):
        print('=' * 50)
        print('名片管理系统v0.01')
        print('1.添加学生信息')
        print('2.修改学生信息')
        print('3.查询学生信息')
        print('4.删除学生信息')
        print('5.显示所有学生信息')
        print('6.查询学生入学平均分')
        print('7.退出系统')
        print('=' * 50)

    def add_new_card_infors(self):
        xuehao = input('请输入学号:')
        name = input('请输入姓名:')
        new_banji = input('请输入新班级:')
        new_phone = input('请输入新的手机号:')
        rxcj = input('请输入入学成绩:')
        new_infor = Student(xuehao, name, new_phone, new_banji, rxcj)
        self.card_infors.append(new_infor)
        print('添加成功')

    def begin(self):
        pass


    def find_card_by_xuehao(self, xuehao):
        find_flag = None
        for temp in self.card_infors:
            if xuehao == temp.xuehao:
                find_flag = temp
            break
        return find_flag


    def find_card_infor(self):
        find_xuehao = input('请输入要查找的学号:')
        find_flag = self.find_card_by_xuehao(find_xuehao)
        if find_flag == None:
            print('查无此人...')
        else:
            print('%st%st%st%st' % (find_flag.name, find_flag.banji, find_flag.phone, find_flag.rxcj))


    def delete_card_infor(self):
        find_xuehao = input('请输入要删除信息的学号:')
        find_flag = self.find_card_by_xuehao(find_xuehao)
        if find_flag == None:
            print('查无此人...')
        else:
            self.card_infors.remove(find_flag)
            print('删除成功')


    def update_card_infor(self):
        find_xuehao = input('请输入要更新信息的学号:')
        find_flag = self.find_card_by_xuehao(find_xuehao)
        if find_flag == None:
            print('查无此人...')
        else:
            new_banji = input('请输入新的班级:')
            new_phone = input('请输入新的手机号:')

            find_flag.banji = new_banji
            find_flag.phone = new_phone
            print('修改成功')

    def show_all_infor(self):
        print('学号t姓名t班级t手机号t入学成绩')
        for temp in self.card_infors:
            print('%st%st%st%st%s' % (temp.xuehao, temp.name, temp.banji, temp.phone, temp.rxcj))

    def average(self):
        sum = float(input('请输入学生成绩：'))
        n = float(input('请输入学生数量:'))
        average = sum / n
        print(average)

    def begin(self):
        while True:
            num = int(input('n请输入操作序号:'))
            if num == 1:
                self.add_new_card_infors()
            elif num == 2:
                self.update_card_infor()
            elif num == 3:
                self.find_card_infor()
            elif num == 4:
                 self.delete_card_infor()
            elif num == 5:
                self.show_all_infor()
            elif num == 6:
                self.average()
            elif num == 7:
                break
            else:
                print('输入有误，请重新输入')

def main():
    mySystem = MySystem()
    mySystem.print_menu()
    mySystem.begin()
main()