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Sat Oct 25 17:14:32 EDT 2003 · https://mail.python.org/pipermail/python-dev/2003-October/039510.html

> it might be "alltrue" and "anytrue" -- the short-circuiting ones,
> returning the first true or false item found respectively, as in:
> 
> def alltrue(seq):
>     for x in seq:
>         if not x: return x
>     else:
>         return True
> 
> def anytrue(seq):
>     for x in seq:
>         if x: return x
>     else:
>         return False
> 
> these seem MUCH more generally useful than 'product' (but,
> I still opine, not quite enough to warrant being built-ins).

These are close to what ABC does with quantifiers.  There, you can
write

  IF EACH x IN sequence HAS x > 0: ...

ABC has the additional quirk that if there's an ELSE branch, you can
use x in it (as a "counter-example").

In Python, you could write this as

  if alltrue(x > 0 for x in sequence): ...

but the current design doesn't expose x to the else branch.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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[Python-Dev] product()