>>>> all('')
> True
>
> Actually the last one surprised me. I expected false. So maybe a resident
> guru can explain that anomaly... I assume it works on the basis of testing
> until it finds a false and so an empty sequence
> always returns true...
The term you're thinking of is "vacuous truth"
http://en.wikipedia.org/wiki/Vacuous_truth
It's true that, for the empty collection, every element is true, since
there are no counterexamples.
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