Andrew Barnert via Python-ideas <python-ideas@python.org> writes:
On Sep 30, 2015, at 18:08, MRAB <python@mrabarnett.plus.com> wrote:
It's only just occurred to me that there's a small inconsistency here. The "?.", "?[" and "?(" will short-circuit on None, whereas the "??" will short-circuit on non-None.
Would that cause any confusion in practice?
I noticed this when I was trying to write out grammar, sample ASTs, and sample bytecode for these things. I went searching the thread and saw no one had pointed it out. I went through docs and blogs for other languages, and didn't see anyone pointing out, complaining about, or offering to clear up any confusion. So I figured I wouldn't mention it, and see if anyone else even noticed.
How is it worse than the fact that and short-circuits on true whereas or short-circuits on false? Short-circuiting logically applies to the case that *can* be short-circuited. For the AST issue, I'm curious as to what you ended up doing about the whole-atom_expr nature of the short-circuiting and the fact that ASTs don't currently represent an atom_expr as a single object containing a list of subscript/attribute/call items?