Ned Deily schrieb: > In article <76vs9tf1f6c5...@mid.individual.net>, > Thomas Heller <thel...@python.net> wrote: >> Diez B. Roggisch schrieb: >> > Thomas Heller wrote: >> >> Python 2.6 contains the json module, which I thought was the renamed (and >> >> improved?) simplejson module that also works on older Python versions. >> >> >> >> However, it seems the json is a lot slower than simplejson. >> >> This little test, run on Python 2.6.2 and WinXP shows a dramatic >> >> difference: >> >> C:\>py26 -m timeit -s "from json import dumps, loads" >> >> "loads(dumps(range(32)))" 1000 loops, best of 3: 618 usec per loop >> >> >> >> C:\>py26 -m timeit -s "from simplejson import dumps, loads" >> >> "loads(dumps(range(32)))" 10000 loops, best of 3: 31 usec per loop> >> >> >> Does anyone have an explanation for that? >> > >> > Dunno about json, but simplejson comes with an (optional) C-based >> > speedup-module. >> > >> > Maybe this isn't part of the standard distribution? >> json has it's own _json speedup module. And funny, on Linux, json >> WITH _json is still somewhat slower (~10%) than simplejson WITHOUT >> the _speedups module. > > According to the svn history in 2.6, the json module was a copy of > simplejson 1.9. The current version of simplejson is 2.0.9 and, > according to its CHANGES.txt, there have been a number of performance > improvements in the various releases since 1.9. Looks like the trunk > (2.7) version of json has been updated to the latest simplejson. >
Ok, thanks. I've submitted a bug for python2.6, but it seems they will not upgrade to a newer version. <http://bugs.python.org/issue6013> Thomas -- http://mail.python.org/mailman/listinfo/python-list
