Python为何读取了数据然后无法打印出来

import file
import re
import cls


#C:\Users\30819\source\repos\Py_Two
Users = []
MyFile = open("Users.txt")
while 1:
    us = cls.student()

    MyUsers = MyFile.readline()
    if MyUsers == "":
        MyFile.close()
        break
    u = MyUsers.split(',')
    us.id = u[0]
    us.Name= u[1]
    Users.append(us)
    pass




for i in Users:
    print(i.Id)
    print(i.Name)
    pass


text内容
1,张三
2,李四