PEP 289: universal and existential operators

[Alex Martelli]

Jeremy Fincher wrote:
   ...
> I think these names also read somewhat more clearly:
> 
> # Check if someone is yelling:
> if all(str.isupper, line.split()):
>   print "Must be a flamewar."
> 
> and:
> 
> # Check if someone yelled at all:
> if any(str.isupper, line.split()):
>   print "Someone yelled."

I'm not sure what these calls are meant represent -- maybe an
interface similar to filter, i.e. a callable then a sequence?
The functions we're considering, whatever their names, would
in any case just take an iterator, so, e.g.:

if all(x.isupper() for x in line.split()):

and the like.


> I believe both these examples are more easily readable with "all" and
> "any" than they would be with "forall" and "exists."

I'll pass on that.  Maybe.  I think I still prefer alltrue and anytrue...


Alex