So this would break many uses of locals(). I'm not sure I like that. On Tue, Oct 20, 2020 at 10:16 AM Steven D'Aprano <st...@pearwood.info> wrote:
> On Tue, Oct 20, 2020 at 05:30:54PM +0300, Serhiy Storchaka wrote: > > > I do not want to create tens of alternate PEPs with minor variations, > > and this issue is not worth a PEP. What is your opinion about this? Is > > it worth to include such optimization? For what kind of variables should > > it be applied? Should it include global '_'? Should it be merely an > > optimization (maybe controlled by the -O option) or change in the > language? > > Assuming that this actually has a benefit, in either speed or memory, > how about this? > > 1. Only eliminate local variables, never globals. > > > 2. By default, only variables with a leading underscore are eliminated. > This will(?) avoid breaking tests for the debugger etc. that you > mentioned. > > > 3. Under -O, allow more aggressive optimization that eliminates > non-underscore variables too. > > > 4. This is an implementation feature, not a language promise. Other > interpreters do not have to follow. > > > 5. To be clear, variables are only eliminated if they are assigned to, > but never written to: > > def func(): > _a = 1 # not eliminated > _b = 2 # eliminated > return _a > > > > -- > Steve > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/DBQIS63WTM4PFAQRDJ6QVUYHN4ZPUDF4/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- --Guido van Rossum (python.org/~guido) *Pronouns: he/him **(why is my pronoun here?)* <http://feministing.com/2015/02/03/how-using-they-as-a-singular-pronoun-can-change-the-world/>
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