[Python-Dev] Inplace operations for PyLong objects
jjevnik at quantopian.com
Fri Sep 1 21:16:37 EDT 2017
The string concat optimization happens in the interpreter dispatch for
On Fri, Sep 1, 2017 at 9:10 PM, Greg Ewing <greg.ewing at canterbury.ac.nz>
> Chris Angelico wrote:
>> This particular example is safe, because the arguments get passed
>> individually - so 'args' has one reference, plus there's one more for
>> the actual function call
> However, that's also true when you use the += operator,
> so if the optimisation is to trigger at all in any useful
> case, the refcount threshold needs to be set higher than
> Some experiments I did suggest that if you set it high
> enough for x += y to trigger it, then it will also be
> triggered in Joe's case.
> BTW, isn't there already a similar optimisation somewhere
> for concatenating strings? Does it still exist? How does
> it avoid this issue?
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