'NoneType' 对象在从 JSON 文件读取时没有属性 'read'

Question

我正在为一个学校项目制作脚本，该项目要求我收到一个 JSON 文件，告诉我车牌在图片中是否可见。现在代码将带有图像的 POST 发送到 API，然后在 return 中给我一个 JSON，JSON 数据被发送到文件"lastResponse.json."

给出错误的代码

with open('lastResponse.json', 'r+') as fp:
        f = json.dump(r.json(), fp, sort_keys=True, indent=4) # Where the response data is sent to the JSON
        data = json.load(f) # Line that triggers the error
        print(data["results"]) # Debug code
        print("------------------") # Debug code
        print(data) # Debug code

        # This statement just checks if a license plate is visible
        if data["results"]["plate"] is None:
            print("No car detected!")
        else:
            print("Car with plate number '" + data["results"]["plate"] + "' has been detected")

错误

Traceback (most recent call last):
  File "DetectionFinished.py", line 19, in <module>
    data = json.load(f)
  File "/usr/lib/python3.7/json/__init__.py", line 293, in load
    return loads(fp.read(),
AttributeError: 'NoneType' object has no attribute 'read'

我在 Python 方面不是很有经验，所以非常感谢您的解释！

Answer 1

事实证明，在重新阅读 API 的文档并使用他们的示例后，我能够解决我的问题

import requests
from pprint import pprint
regions = ['gb', 'it']
with open('/path/to/car.jpg', 'rb') as fp:
    response = requests.post(
        'https://api.platerecognizer.com/v1/plate-reader/',
        data=dict(regions=regions),  # Optional
        files=dict(upload=fp),
        headers={'Authorization': 'Token API_TOKEN'})
pprint(response.json())

'NoneType' 对象在从 JSON 文件读取时没有属性 'read'

'NoneType' object has no attribute 'read' when reading from JSON file

json

attributeerror

python-3.7