python选课系统demo的小练习

#简化选课系统代码:先登陆,然后判断身份并实例化,根据身份对应的类,让用户选择
class Manager:
    operate_dict=[
        ('创造学生账号',"creat_student"),
        ('查看学生信息',"check_student")
                 ]
    def __init__(self,name):
        self.name=name
    def creat_student(self):
        print('创建学生账号')
    def check_student(self):
        print('查看学生信息')

class Student:
    def __init__(self, name):
        self.name = name
    def check(cls):
        print('查看课程')
    def login(cls):
        print('登录')

class Teacher:
    def __init__(self, name):
        self.name = name
def login():
    username=input('user:')
    password=input('password:')
    with open('userinfo')as f:
        for line in f :
            user,pwd,ident=line.strip().split('|')
            if user==username and pwd==password:
                print('登陆成功')
                return username,ident
import sys
def main():
    usr,id=login()
    file=sys.modules['__main__']
    cls=getattr(file,id)
    obj=cls(usr)
    Operate_dict=cls.operate_dict
    print(Operate_dict)
    for num,item in enumerate(Operate_dict):
        print(num,item[0])
    choice=int(input("num>>>"))
    choice_item=Operate_dict[choice-1]
    getattr(obj.choice_item[1])()
main()