I will frequently do simple computation with literals to make my code more clear:
t = 2 * 3600 # 2 hours in seconds But I see no need to optimize this kind of thing -- it would never be in a tight loop. -CHB On Sun, Nov 28, 2021 at 3:06 PM Rob Cliffe via Python-Dev < python-dev@python.org> wrote: > I am slightly surprised that it seems to be *easier* to fold selected > constant expressions than to have more generic code to fold them all. > Or at least, all those that don't contain containers, such as > 1 in [0,1,2] > Rob Cliffe > > On 28/11/2021 21:10, Eric V. Smith wrote: > >> On Nov 28, 2021, at 3:03 PM, Serhiy Storchaka <storch...@gmail.com> > wrote: > >> > >> 28.11.21 17:13, Skip Montanaro пише: > >>>> That is not entirely true: > https://github.com/python/cpython/pull/29639#issuecomment-974146979 > >>> The only places I've seen "if 0:" or "if False:" in live code was for > >>> debugging. Optimizing that hardly seems necessary. In any case, the > >>> original comment was about comparisons of two constants. I suppose > >>> sweeping up all of that into a constant expression folding/elimination > >>> step performed on the AST and/or during peephole optimization would > >>> cover both cases. > >> "if 0:" and "if False:" is already optimized by the compiler. The OP > >> proposes to optimize "2 < 1", and I cannot imagine any use case for > this. > > I agree. I suggest we don’t add this optimization. > > > > Eric > > _______________________________________________ > > Python-Dev mailing list -- python-dev@python.org > > To unsubscribe send an email to python-dev-le...@python.org > > https://mail.python.org/mailman3/lists/python-dev.python.org/ > > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/JP6FF2RHDQSIOS6ZAI45S7X6UXWGPBKR/ > > Code of Conduct: http://python.org/psf/codeofconduct/ > > _______________________________________________ > Python-Dev mailing list -- python-dev@python.org > To unsubscribe send an email to python-dev-le...@python.org > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/python-dev@python.org/message/LD3XHINO7VPDE5EMNFD5ON4FQIJLY4DI/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Christopher Barker, PhD (Chris) Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
_______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/NJWCKNV4ULEBHSLR44G3HNVROE4IAM47/ Code of Conduct: http://python.org/psf/codeofconduct/
