On Mon, 16 Jun 2008 11:30:19 -0600, Ian Kelly <[EMAIL PROTECTED]> wrote:
On Mon, Jun 16, 2008 at 11:09 AM, Jean-Paul Calderone
<[EMAIL PROTECTED]> wrote:
It will depend what version of Python you're using and the *exact* details
of the code in question. An optimization was introduced where, if the
string being concatenated to is not referred to anywhere else, it will be
re-sized in place. This means you'll probably see sub-quadratic behavior,
but only with a version of Python where this optimization exists and only
if the code can manage to trigger it.
AFAICT, PyString_Concat never calls _PyString_Resize. Am I looking in
the wrong place?
Yep. The optimization is done directly from the eval loop. Take a look at
ceval.c, if you search for _PyString_Resize you should see it.
Jean-Paul
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