Petr Viktorin wrote: > Should we care about hacks/optimizations that rely on having the only > reference (or all references), e.g. mutating a tuple if it has refcount > 1? Immortal objects shouldn't break them (the special case simply won't > apply), but this wording would make them illegal. > AFAIK CPython uses this internally, but I don't know how > prevalent/useful it is in third-party code.
For what it's worth Cython does this for string concatenation to concatenate in place if possible (this optimization was copied from CPython). It could be disabled relatively easily if it became a problem (it's already CPython only and version checked so it'd just need another upper-bound version check). _______________________________________________ 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/CDNQK5RMXSLLYFNIXRORL7GTKU6B4BVR/ Code of Conduct: http://python.org/psf/codeofconduct/
