It seems like you're trying to raise a `JsonDecodeError` in Python when decoding JSON data, but the input `err.value` is `None`. Here's how you can raise the error with an appropriate message: ```python import json def json_decode_error(message, s, error=None): if error is None: error = json.JSONDecodeError(message, s, 0) raise error # Usage example s = '{"key": "value"}' # Sample JSON string try: data = json.loads(s) except json.JSONDecodeError as e: json_decode_error("expecting value", s, e) ``` In this code, the `json_decode_error` function takes three arguments: the expected error message, the JSON string `s`, and the actual error object if available. If `error` is `None`, it creates a new `JSONDecodeError` with the provided message and the current position in the string. When calling `json.loads()`, if there's a JSON decoding error, the exception will be caught, and the custom error will be raised using the `json_decode_error` function. [2024-04-09 15:46:11 | AI写代码神器 | 237点数解答]