On Wed, May 27, 2020 at 5:19 AM Alex Hall <alex.moj...@gmail.com> wrote: > > On Tue, May 26, 2020 at 9:05 PM Chris Angelico <ros...@gmail.com> wrote: >> >> And the "is this name bound" check would potentially >> have other value, too. > > > Can you think of any examples?
When you're looping, searching for something, and then seeing if you found any. If you want to stop at the first, you can use 'break' and 'else' (although a lot of people don't know about that), but what if you're locating the last match, and can't search in reverse? Or some sort of best match or all match? How do you then say "none found"? Usually you end up needing a sentinel, but if you could simply leave the variable unbound, you could then check for that at the end. ChrisA _______________________________________________ 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/JAS5EHWZH3GGJKHXTPW2XOOLYIETT55Q/ Code of Conduct: http://python.org/psf/codeofconduct/
