During handling of the above exception, another exception occurred.

Question

Problem :

I am very new to Python programming. My below code gives me errors :

with open(json_file) as jfile:
    try:
        json_config = json.load(jfile)
    except ValueError as e:
        raise Exception('Invalid json: {}'.format(e))

Please find below errors caused by above code.

json.decoder.JSONDecodeError: Expecting ',' delimiter: line 103 column 9 (char 1093)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
<....>
raise Exception('Invalid json: {}'.format(e))
Exception: Invalid json: Expecting ',' delimiter: line 103 column 9 (char 1093)

Can some expert tell me how can I quickly fix above errors?

Answer 1

I think now you are having very strange issue which is related to raising a ValueError exception inside the another caught exception. If you are looking for the quick fix for your error then you need to change below line of code

raise Exception('Invalid json: {}'.format(e))

To the below correct one.

raise Exception('Invalid json: {}'.format(e)) from None

It will make your end code as below:

with open(json_file) as jfile:
    try:
        json_config = json.load(jfile)
    except ValueError as e:
        raise Exception('Invalid json: {}'.format(e)) from None

After making above changes in your code you must get a desired result of catching the exception. Hope the solution helped you in quick fix.