Tim Peters <tim.peters@gmail.com> writes: ...

So we're switching to a boolean flag again, named solidbefore? The great advantage to that would be easy of finding via Google. While there a hundred times more hits on "python which" than on "python fold", there are still over 800,000 hits on the latter. There only 7 on

python "solidbefore"

although you need the quotes to cut it back from some thousands ;-)

The first hit on google for *python datetime fold* is PEP 495.