[dragonwriter]

> But I believe if 'any' implies 'at least one' so should 'all' otherwise they use different conventions.

The conventions they use are not an arbitrary choice, and are those of predicate logic. any() is the “for any” (existential quantification) operator, while all() is the “for all” (universal quantification) operator.

They are deeply connected: “all items in xs are true” is “there are not any items in xs that are not true”, or, in code terms, all(xs) == not any(not x for x in xs).

And, vice versa, any(xs) == not all(not x for x in xs)

[rightbyte]

Sure thinking about it the 'all ([]) => True', 'any ([]) => False' might be more intuitive.