[Python-Dev] Status of json (simplejson) in cpython (original) (raw)

Stefan Behnel stefan_ml at behnel.de
Sun Apr 17 09:21:32 CEST 2011

Antoine Pitrou, 16.04.2011 19:27:

On Sat, 16 Apr 2011 16:47:49 +0000 (UTC) Vinay Sajip wrote:

Bob made a comment in passing that simplejson (Python) is about as fast as stdlib json (C extension), on 2.x. I think Bob tested with an outdated version of the stdlib json module (2.6 or 2.7, perhaps). In my latest measurements, the 3.2 json C module is as fast as the C simplejson module, the only difference being in parsing of numbers, which is addressed in http://bugs.python.org/issue11856

Ok, but then, what's the purpose of having the old Python implementation in the stdlib? The other Python implementations certainly won't be happy with something that is way slower (algorithmically!) than the current version of the non-stdlib implementation. The fact that the CPython json maintainers are happy with the performance of the C implementation does not mean that the performance of the pure Python implementation can be ignored now.

Note: I don't personally care about this question since Cython does not suffer from this issue anyway. This is just the general question about the relation of the C module and the Python module in the stdlib. Functional compatibility is not necessarily enough.

Stefan

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