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...-------')