On Tue, 19 Nov 2013 16:06:22 -0600 Tim Peters <tim.peters@gmail.com> wrote:
[Antoine]
Ahah, ok, I see where you're going. But how many other implementations of unpickling are there?
[Tim]
That's something you should have researched when writing the PEP ;-) How many implementations of Python aren't CPython? That's probably the answer. I'm not an expert on that, but there's more than one.
[Antoine]
But "how many of them use something else than Lib/pickle.py" is the actual question.
I don't know - and neither do you ;-)
I do know that I'd like, e.g., a version of pickletools.dis() in CPython that _did_ show the framing bits, for debugging. That's a bare-bones "unpickler". I don't know how many other "partial unpicklers" exist in the wild either. But their lives would also be much easier if the framing stuff were explicit. "Mandatory optimization" should be an oxymoron ;-)
Well, I don't think it's a big deal to add a FRAME opcode if it doesn't change the current framing logic. I'd like to defer to Alexandre on this one, anyway. Regards Antoine.