On Sat, Feb 22, 2014 at 8:20 PM, Antoine Pitrou <solip...@pitrou.net> wrote: > On Sat, 22 Feb 2014 16:12:27 +0900 > "Stephen J. Turnbull" <step...@xemacs.org> wrote: >> >> Note in support: I originally thought that "get" methods would be more >> efficient, but since Nick pointed out that "haveattr" is implemented >> by catching the exception (Yikes! LBYL implemented by using EAFP!), I >> assume that get methods also are (explicitly or implicitly) >> implemented that way. > > Well, the only way to know that a key (or attribute) exists is to do > the lookup. What else would you suggest? > > And, yes, EAFP can avoid race conditions and the like (besides being > more efficient with non-trivial keys).
Which means that, fundamentally, EAFP is the way to do it. So if PEP 463 expressions had existed from the beginning, hasattr() probably wouldn't have been written - people would just use an except-expression instead. ChrisA _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
