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I think Bob tested with an outdated version of the stdlib json module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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