Python 类转换：将学生类转换为教师类

class Person:
    def __init__(self, num, name, sex):
        self.num = num
        self.name = name
        self.sex = sex

class Student(Person):
    def __init__(self, num, name, sex, grade):
        super().__init__(num, name, sex)
        self.grade = grade

class Teacher(Person):
    def __init__(self, num, name, sex, title):
        super().__init__(num, name, sex)
        self.title = title

def convert_student_to_teacher(student):
    return Teacher(student.num, student.name, student.sex, '助教')

# 测试代码
s = Student('001', '小明', '男', '大一')
t = convert_student_to_teacher(s)
print(t.num, t.name, t.sex, t.title)  # 001 小明 男 助教