Mark Shannon <m...@hotpy.org> added the comment:
I think this is a combination of https://bugs.python.org/issue44297 and the PREDICT macros. I don't have a windows machine to confirm this on, but I suspect that if you rewrite `doit` as: def doit(): o = ((1,2), (3,4)) o = (a for a in o) for tup in o: x = tup[0] y = tup[1] then you should be able to observe a difference between Windows and Mac on 3.9 as well. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue44450> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
