自学教程：python面向对象版学生信息管理系统

class StudentManger(object):    student_info_lst = []  # 保存所有学生的信息    @staticmethod    def show_menu():        '''显示所有功能'''        print('欢迎来到学生管理系统')        print('新增学员请按[1]')        print('显示全部请按[2]')        print('查询学员请按[3]')        print('退出系统请按[0]')     def add_student(self):        '''这是新增学员的功能'''        print('-------新增学员功能-------')        name = input('请输入姓名:')        age = input('请输入年龄:')        gender = input('请输入性别:')        phone = input('请输入手机:')        # print(name,age,gender,phone)        # 将用户输入的信息保存到一个字典中。        dic = {}        dic['name'] = name        dic['age'] = age        dic['gender'] = gender        dic['phone'] = phone        # print(dic)        # 注意：将用户数的信息保存到全局变量student_info_lst        # 列表中，让其他功能使用列表中的数据。        self.student_info_lst.append(dic)        # print(student_info_lst)        print('添加成功了...')     def alignment(self,s, space):        '''输出对齐'''        s1 = s.encode('gbk')        space = space - len(s1)        s = s + ' ' * space        return s     def show_all_student(self):        print('-------显示所有的学员功能-------')        if not self.student_info_lst:            print('还没有学员呢，请添加学员')            return         # 显示学员的信息        name = self.alignment('name', 15)        age = self.alignment('age', 15)        gender = self.alignment('gender', 15)        phone = self.alignment('phone', 15)        print(name, age, gender, phone)         for dic in self.student_info_lst:            name = dic['name']            age = dic['age']            gender = dic['gender']            phone = dic['phone']            name = self.alignment(name, 15)            age = self.alignment(age, 15)            gender = self.alignment(gender, 15)            phone = self.alignment(phone, 15)            print(name, age, gender, phone)     def modify_student_info(self,old_value, msg):        '''处理修改用户名时不输入问题'''        new_name = input(msg)        if new_name.strip():            return new_name        else:            return old_value     def deal_student(self,dic):        action_str = input("【1】修改 【2】删除 【0】返回上一级菜单,请选择要执行的操作：")        if action_str == '1':            # 第一版修改            # dic['name'] = input('请输入姓名:')            # dic['age'] = input('请输入年龄:')            # dic['gender'] = input('请输入性别:')            # dic['phone'] = input('请输入电话:')            # 第二版--输入空格后能继续运行。            dic['name'] = self.modify_student_info(dic['name'], '请输入姓名:')            dic['age'] = self.modify_student_info(dic['age'], '请输入年龄:')            dic['gender'] = self.modify_student_info(dic['gender'], '请输入性别:')            dic['phone'] = self.modify_student_info(dic['phone'], '请输入电话:')             print('修改成功！！！')         elif action_str == '2':            self.student_info_lst.remove(dic)            print('删除成功了!!!')        elif action_str == '0':            pass     def search_student_by_name(self):        '''搜索学生'''        print('-------欢迎来到查询学员功能-------')        if self.student_info_lst:            name = input('请输入要查询学员的姓名:')            for dic in self.student_info_lst:                if dic['name'] == name:                    name = self.alignment('name', 15)                    age = self.alignment('age', 15)                    gender = self.alignment('gender', 15)                    phone = self.alignment('phone', 15)                    print(name, age, gender, phone)                     name = dic['name']                    age = dic['age']                    gender = dic['gender']                    phone = dic['phone']                    name = self.alignment(name, 15)                    age = self.alignment(age, 15)                    gender = self.alignment(gender, 15)                    phone = self.alignment(phone, 15)                    print(name, age, gender, phone)                    # 处理学生信息                    self.deal_student(dic)                     break            else:                print('not have such student')        else:            print('not have student please add student')  while True:    StudentManger.show_menu()    student_manager=StudentManger()    action_str = input('请输入你要选择数字:')    lst = ['0', '1', '2', '3']    if action_str in lst:        if action_str == '1':            student_manager.add_student()        elif action_str == '2':            student_manager.show_all_student()        elif action_str == '3':            student_manager.search_student_by_name()        elif action_str == '0':            print('三位慢走，欢迎下次光临')            break     else:        print('-------sb 输出错了请重新输入...-------')