实现抽象类

我是Python编码的初学者,我尝试学习抽象类。我在实现两个扩展抽象类考试的考试时遇到了问题,这两个考试定义了诊断测试的契约。

class Person:
def __init__(self, name: str, age: int):
self.name = name
self.age = age

class Patient(Person):
def __init__(self, name: str, age: int, id: str, symptoms: list\[str\], cholesterol: float, iron_level: float):
super().__init__(name, age)
self.id = id
self.symptoms = symptoms
self.cholesterol = cholesterol
self.iron_level = iron_level\`

class CholesterolExam(Exam):
def __init__(self):
super().__init__('Cholesterol Exam')

    def perform_exam(self,cholesterol_exam):
        if cholesterol_exam >= 200:
            return False
        return True

class IronLevelExam(Exam):
def __init__(self):
super().__init__('Iron Exam')

    def perform_exam(self,iron_level_exam):
        if iron_level_exam>50 and iron_level_exam<170:
            return True    

class Test03(unittest.TestCase):
    def test_doctor(self):
        cholesterol_exam = CholesterolExam()
        iron_level_exam = IronLevelExam()
        p = Patient('John', 30, '001', ['cough', 'fever'], 180, 300)
        cholesterol_exam_result, iron_exam_result = [exam.perform_exam(p) for exam in [cholesterol_exam, iron_level_exam]]

        self.assertTrue(cholesterol_exam_result)
        self.assertFalse(iron_exam_result)

test(Test03)

我收到错误消息:

test_doctor中的第32行 胆固醇检查结果,铁水平检查结果=[胆固醇检查中的检查性能检查(p)]

第12行,执行考试 如果胆固醇检查>=200:

类型错误:“>=”“Patient”和“int”的实例之间不支持