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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Inconsistent JSON serialization error messages","articleBody":"# Bug report\r\n\r\nWhen you try to serialize a `NaN`, `inf` or `-inf` with `json.dumps(..., allow_nan=False)`, the error messages are inconsistent, depending on whether you use the `indent` argument or not.\r\n\r\n```python\r\n\u003e\u003e\u003e json.dumps(float('nan'), allow_nan=False)\r\nValueError: Out of range float values are not JSON compliant\r\n\r\n\u003e\u003e\u003e json.dumps(float('nan'), allow_nan=False, indent=4)\r\nValueError: Out of range float values are not JSON compliant: nan\r\n```\r\n\r\nThat is because if you don't use `indent`, the encoding is done in C code [here](https://github.com/python/cpython/blob/0563be23a557917228a8b48cbb31bda285a3a815/Modules/_json.c#L1321-L1327),\r\nbut if you use `indent`, the encoding is done in pure Python code [here](https://github.com/python/cpython/blob/0563be23a557917228a8b48cbb31bda285a3a815/Lib/json/encoder.py#L239-L242), and the error messages are different between the two.\r\n\r\n# Your environment\r\n\r\n- CPython versions tested on: 3.11.0\r\n- Operating system and architecture: MacOS 12.6, Apple Silicon\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-99926\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/fnesveda","@type":"Person","name":"fnesveda"},"datePublished":"2022-12-01T14:25:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/99925/cpython/issues/99925"}