Why is json.loads throwing JSONDecodeError: Expecting value-CodePudding

I have a string like:

j = '{"type":"x","key":"A","attributes":{"label":"test","visible":True,"advancedOptions":True},"fees":[{"type":"set","key":"fee","attributes":{"amount":"5","type":"percent","label":"Test","fee":{"value":"7","type":"percent"},"visible":True}}]}'

I'm just wondering why this code works:

exec('t = '   j)
print(json.dumps(t, indent=4))

but this code doesn't

print(json.dumps(json.load(j), indent=4))

It doesn't make sense to me that if a string is first converted into a dictionary, you can load it as json, but you can't convert that exact same string into a json directly %\ ...

JSONDecodeError: Expecting value line 1 column 40 (char 39)

Has anyone run into anything like this before?

I read somewhere on the internet that it might have something to do with the size of the string, where json loads just can't handle it or something.

CodePudding user response：

Your data is not JSON (e.g. True is not JSON) but Python.

You can use ast.literal_eval() instead of json.loads() on that string to parse it as a Python literal and end up with a dict.

>>> import ast
>>> j = '{"type":"x","key":"A","attributes":{"label":"test","visible":True,"advancedOptions":True},"fees":[{"type":"set","key":"fee","attributes":{"amount":"5","type":"percent","label":"Test","fee":{"value":"7","type":"percent"},"visible":True}}]}'
>>> ast.literal_eval(j)
{'type': 'x', 'key': 'A', 'attributes': {'label': 'test', 'visible': True, 'advancedOptions': True}, 'fees': [{'type': 'set', 'key': 'fee', 'attributes': {'amount': '5', 'type': 'percent', 'label': 'Test', 'fee': {'value': '7', 'type': 'percent'}, 'visible': True}}]}