Message 69616 - Python tracker

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Author	gregory.p.smith
Recipients	gregory.p.smith, gvanrossum, jyasskin, rhettinger, theller
Date	2008-07-13.18:38:06
SpamBayes Score	0.05148214
Marked as misclassified	No
Message-id	<1215974308.12.0.666355325633.issue2303@psf.upfronthosting.co.za>
In-reply-to

Content
% ./python.exe -mtimeit 'isinstance(3, int)' 1000000 loops, best of 3: 0.269 usec per loop % ../release25-maint/python.exe -mtimeit 'isinstance(3, int)'1000000 loops, best of 3: 0.335 usec per loop So I'd say its no longer 4x slower these days. Looking at the Object/abstract.c it appears the fix to this has already been checked in. PyObject_IsInstance already has this in it: /* Quick test for an exact match / if (Py_TYPE(inst) == (PyTypeObject )cls) return 1; closing.

% ./python.exe -mtimeit 'isinstance(3, int)'
1000000 loops, best of 3: 0.269 usec per loop
% ../release25-maint/python.exe -mtimeit 'isinstance(3, int)'1000000
loops, best of 3: 0.335 usec per loop

So I'd say its no longer 4x slower these days.

Looking at the Object/abstract.c it appears the fix to this has already
been checked in.  PyObject_IsInstance already has this in it:

        /* Quick test for an exact match */
        if (Py_TYPE(inst) == (PyTypeObject *)cls)
                return 1;

closing.

History
Date	User	Action	Args
2008-07-13 18:38:28	gregory.p.smith	set	spambayes_score: 0.0514821 -> 0.05148214 recipients: + gregory.p.smith, gvanrossum, theller, rhettinger, jyasskin
2008-07-13 18:38:28	gregory.p.smith	set	spambayes_score: 0.0514821 -> 0.0514821 messageid: <1215974308.12.0.666355325633.issue2303@psf.upfronthosting.co.za>
2008-07-13 18:38:06	gregory.p.smith	link	issue2303 messages
2008-07-13 18:38:06	gregory.p.smith	create