On 20/11/21 08:27, dn via Tutor wrote: > > This problem has all the flavor of self-flagellation! > > Some relief may be available through "Chapter 8 - Advanced Iterators" of > Mark Pilgrim's (online) book "Dive into Python 3" > (https://diveintopython3.net/index.html). Thanks dn for the tip, it could be just what I need. -- Regards, Phil