New submission from Ben Kurtovic <ben.kurto...@gmail.com>:
json.dump vs. json.dumps have inconsistent error messages when encoding NaN with allow_nan=False: >>> json.dumps(float('nan'), allow_nan=False) ValueError: Out of range float values are not JSON compliant >>> json.dump(float('nan'), sys.stdout, allow_nan=False) ValueError: Out of range float values are not JSON compliant: nan json.dump's error includes the value (which is useful); json.dumps's does not. json.dumps uses this C implementation: https://github.com/python/cpython/blob/d67de0a30d76c6a28056bae22fd7d13f2e111b77/Modules/_json.c#L1340 json.dump uses this Python implementation: https://github.com/python/cpython/blob/d67de0a30d76c6a28056bae22fd7d13f2e111b77/Lib/json/encoder.py#L223 (Separately, is it expected that only one uses the C implementation? This seems it could have unexpected performance implications - without testing, I would've expected json.dump to take the "faster" path since it doesn't need to hold the entire encoded string in memory.) ---------- components: Extension Modules, Library (Lib) messages: 377450 nosy: earwig priority: normal severity: normal status: open title: Inconsistent errors for JSON-encoding NaNs with allow_nan=False type: behavior versions: Python 3.10, Python 3.8, Python 3.9 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue41852> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com