[python-uk] A stack with better performance than using a list

[Andy Robinson]

Are you sure that their test infrastructure was behaving correctly?
Is it widely used, day in day out, by thousands, and known to be
reliable?  Did your colleagues all brag "no problem"?  Or is it
possible that the whole execution framework threw a momentary wobbly
while trying to load up some large text file off some remote cloud?

Andy