Gregory P. Smith <g...@krypto.org> added the comment:
Thanks, that makes sense. And it at least less ugly than the __new__ hack I was thinking of as a workaround. though similar in spirit. presumably self.append should get the same treatment for completeness given the PEP 307 text. I didn't notice a place in the Python pickle docs that mentioned this specific thing about listitems and the need for append/extend. I didn't do a thorough read though, maybe I overlooked something? If not, it'd be worth figuring out how to get this uninitialized class calling of append/extend/__setitem__ for list and dict objects detailed in the main docs rather than off in the PEP. It's semi-mentioned https://docs.python.org/3/library/pickle.html#object.__reduce__ here which is what the PEP added I suppose, but given this code has no custom __reduce__, we need to explicitly mention that list and dict subclasses supporting pickling/copying may need to be prepared to handle this situation. With a versionchanged:: 3.7 noting that it now always applies to list subclasses without their own __reduce__. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue43946> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
