New submission from INADA Naoki: I prefer ensure_ascii=False because it's efficient. But I notice it is very slower.
On Python 3.4.2: In [3]: %timeit json.dumps([{'hello': 'world'}]*100) 10000 loops, best of 3: 74.8 µs per loop In [4]: %timeit json.dumps([{'hello': 'world'}]*100, ensure_ascii=False) 1000 loops, best of 3: 259 µs per loop On Python HEAD with attached patch: In [2]: %timeit json.dumps([{'hello': 'world'}]*100) 10000 loops, best of 3: 80.8 µs per loop In [3]: %timeit json.dumps([{'hello': 'world'}]*100, ensure_ascii=False) 10000 loops, best of 3: 80.4 µs per loop ---------- components: Library (Lib) files: json-fast-unicode-encode.patch keywords: patch messages: 233752 nosy: naoki priority: normal severity: normal status: open title: json.dumps(ensure_ascii=False) is ~10x slower than json.dumps() versions: Python 3.5 Added file: http://bugs.python.org/file37653/json-fast-unicode-encode.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue23206> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com