类型注解问题1

class Person:
    name = None
    age = None
    job = None

    def __init__(self, name, age, job):
        self.name = name
        self.age = age
        self.job = job

    def __str__(self):
        return f'姓名：{
      
      self.name}，年龄：{
      
      self.age}，工作：{
      
      self.job}'


p1 = Person('smith', 20, 'java工程师')
p2 = Person('king', 18, '学生')
p3 = Person('HSP', 26, '老师')

person_list: list = [p1, p2, p3]


def bubble_sort(person_list: list):
    for i in range(len(person_list) - 1):
        for j in range(len(person_list) - 1 - i):
            if person_list[j].age < person_list[j + 1].age:
                person_list[j].age, person_list[j + 1].age = person_list[j + 1].age, person_list[j].age
    return person_list


new_list = bubble_sort(person_list)
for i in new_list:
    print(i)

person_list是一个元素类型为Person对象的列表，但是我加上注解会报错无法识别，是不是不支持这样写呢？

Traceback (most recent call last):
  File "D:/PythonProject/hsp/复习.py", line 19, in <module>
    person_list: list[Person] = [p1, p2, p3]
TypeError: 'type' object is not subscriptable