和老师代码一样函数input无法调用，请哪位大佬帮忙指点一下

class StudentManagerView:
def int(self):
self.__manager = StudentManagerController()

def __despaly_menu(self):
    print("1)添加学生")
    print("2)显示学生")
    print("3)删除学生")
    print("4)修改学生")
    print("5)按照成绩升序显示学生")

def __select_menu(self):
    item = input("请输入：")
    if item == 1:
        self.__input_student()
    elif item == 2:
        self.__output_student(self.__manager.stu_list)
    elif item == 3:
        pass

elif item == 4:
pass
elif item == 5:
pass

def main(self):
while True:
self.despaly_menu()
self.select_menu()

def __input_student(self):
    name = input("请输入姓名：")
    age = int(input("请输入年龄："))
    score = int(input("请输入成绩："))
    stu = StudentModel(n01, name, age, score)
    self.__manager.add_student(stu)