On Fri, Jan 19, 2018 at 8:37 AM, Jason Swails <jason.swa...@gmail.com> wrote: > The root cause of the issue comes down to the following check returning > true: > > isinstance([], collections.Mapping) > > Obviously you can get this behavior if you register `list` as a subclass of > the Mapping ABC, but I'm not doing that. Because the issue is so rare (but > still common enough that I need to address it), it's hard to reproduce in a > bench test.
Just a quickie: Have you confirmed for sure that it is a vanilla list - that "type(x) is type([])" - not some subclass thereof? Other than that, I don't have any specific tips; have fun instrumenting your code to try to figure this out! (And I mean that sincerely - this kind of thing CAN be fun.) ChrisA -- https://mail.python.org/mailman/listinfo/python-list
