Greg Ewing writes: > "Did the user supply a value for this optional argument?" is a > simple and reasonable question to ask.
True. > It deserves to have a simple and direct way of answering it that > always works. "Deserves"? I wouldn't go farther than "it might be fun to have" that. In Emacs Lisp, it's useful to defend against users who don't update their package libraries with #'boundp and #'fboundp checks. These invariably occur in top-level forms, though, not on function arguments. But what's the use case for this magical predicate? Writing a nastygram to the user's boss if they dare to use gregs-package._sentinels._af5d8a21858f42808c9bcc17012b77bcc2fd6ab3b071dbd4a05f13f410470541 as an actual argument? _______________________________________________ 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/HFO6BK35FTMUJPKNAWIPLYSI6FDHUGIA/ Code of Conduct: http://python.org/psf/codeofconduct/
