[Python-Dev] product()

[Jeremy Fincher]

On Sunday 26 October 2003 09:39 am, Nick Coghlan wrote:
>  >>> if all(pred(x) for x in values): pass       # alltrue
>  >>> if any(pred(x) for x in values): pass       # anytrue

Yeah, that does read nicely, which is why I think it's pretty common in FPLs.

>  >>> if any(not pred(x) for x in values): pass   # anyfalse

I've always expressed this as:

if not all(pred(x) for x in values): pass

>  >>> if all(not pred(x) for x in values): pass   # allfalse

And this as:

if not any(pred(x) for x in values): pass

It's slightly more efficient (only one negation), and it seems to maintain 
better the pseudocode-like aspect that we so much adore in Python :)

Jeremy