New submission from Antoine Pitrou <pit...@free.fr>: In Python 3.x, parsing JSON numbers involve calling PyLong_FromUnicode or PyFloat_FromString with an unicode object. These functions are quite costly because they call PyUnicode_TransformDecimalToASCII(). But JSON numbers are always pure ASCII. This patch does the ASCII conversion ourselves.
Small benchmark with integers: ./python -m timeit -s \ "from json import loads, dumps; d=list(i for i in range(1000)); s=dumps(d)" \ "loads(s)" -> without patch: 705 usec per loop -> with patch: 103 usec per loop ---------- components: Library (Lib) files: jsonnumbers.patch keywords: patch messages: 133891 nosy: mark.dickinson, pitrou, rhettinger priority: normal severity: normal stage: patch review status: open title: Optimize parsing of JSON numbers type: performance versions: Python 3.3 Added file: http://bugs.python.org/file21681/jsonnumbers.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue11856> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
