On Thu, Mar 13, 2014 at 7:14 AM, Barry Warsaw <ba...@python.org> wrote: > Interestingly enough, where ternaries are most useful are in the same > situations where I think exception expressions would be most useful, in the > setting of a variable or attribute to one of two different values. In both > branches of the conditional, the left hand side is the same target, and what > differs is the value being assigned to the LHS. > > Looking over exception examples from a large code base, I find it rare (but > not nonexistent) that exceptions are used in the same situation. But that > could be because I'm so comfortable with .get() and other helpers. Ternary > expressions seem more compelling. But there's definitely some overlap, which > is perhaps why the colon seems so jarring to me.
When you say "looking over", do you mean with the Mk 1 Human Eyeball, or with the script from my research? https://github.com/Rosuav/ExceptExpr/blob/master/find_except_expr.py If you've used the script and have some stats to offer, I'd love to see them. So far, all I have is the stdlib, which isn't necessarily representative. Bear in mind, there isn't a .get() for every situation. You can use hasattr() in place of AttributeError, which isn't quite the same thing, but most of the OSError-raising APIs don't (as far as I know) offer a way to return a default instead of raising. So even if you do generally use dict.get(), there'll likely be some that the script would catch. 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
