On Sat, Jul 1, 2017 at 6:11 PM, Steven D'Aprano <st...@pearwood.info> wrote: >> - So there's then a new conditional import (e.g. in a compat package)? What >> does this add? > > try: chain > except NameError: from itertools import chain > > Two lines, if and only if you both need chain and want to support > versions of Python older than 3.7. > > There's no need to import it if you aren't going to use it. >
It'd be even simpler. If you want to support <3.7 and 3.7+, you write: from itertools import chain At least, I presume it isn't going to be *removed* from itertools. Promotion to builtin shouldn't break pre-existing code, so the way to be compatible with pre-promotion Pythons is simply to code for those and not take advantage of the new builtin. ChrisA _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
