PyTest中PUT请求第二次执行总是失败的排查求助

在PyTest中执行PUT请求时，第二次总是失败，但使用Postman连续发送多次PUT请求却无此异常。PyTest中首次执行PUT请求成功，但第二次必失败，只有每次修改JSON请求内容才能成功，不知该如何调试。测试按post、get、update、delete的顺序执行，但只有update（PUT请求）失败。

使用的技术栈版本 #

• python 3.10
• flask 2.1.2
• sqlalchemy 1.4.39

PUT请求测试代码 #

@pytest.mark.asyncio
async def test_put_student():
    randomFavSub = ""
    randomFavSub = randomFavSub.join(random.choice(letters) for i in range(10))
    request_dict = {
        "user_id": "0e4c1d44-04f6-4a26-a02d-8e67a91b00f1",
        "fav_sub": "Subject" + randomFavSub
    }
    headers = {
        'content-type': 'application/json',
        'Accepts': 'application/json'
    }
    async with aiohttp.ClientSession(headers=headers) as session:
        await asyncio.sleep(5)
        async with session.put(URL + GLOBAL_ID, json=request_dict) as response:
            if response.status == 200:
                data = await response.json()
                data_student = data['student']
                data_student_first = data_student[0]
            else:
                data = await response.text()
                assert False, "modify Failure response is text " + str(response.status)

    # TODO #38 Generalize the assert to all conditions
    for key, value in request_dict.items():
        assert (value == data_student_first[key]), "modify FAILURE " + key

GLOBAL_ID来源（POST请求测试代码） #

@pytest.mark.asyncio
async def test_post_student():
    request_dict = {
        "user_id": "0e4c1d44-04f6-4a26-a02d-8e67a91b00f1",
        "fav_sub": "Science"
    }

    global GLOBAL_ID
    async with aiohttp.ClientSession() as session:
        async with session.post(URL, json=request_dict) as response:
            if response.status == 200:
                data = await response.json()
                data_student = data['student']
                data_student_first = data_student[0]
                GLOBAL_ID = data_student_first['id']
                assert GLOBAL_ID, "GLOBAL_ID couldn't be created"
            else:
                data = await response.text()
                assert False, 'retrieve Failure response is text'

    for key, value in request_dict.items():
        assert value == data_student_first[key], "create FAILURE key"

内容的提问来源于stack exchange，提问作者miazocool