> >> seq = [1,2,3,4,5]
> >> if any(seq, lambda x: x==5):
> >> ...
> >>
> >> which is clearly more readable than
> >>
> >> reduce(seq, lambda x,y: x or y==5, False)
> >
> > How about this?
> >
> > if any(x==5 for x in seq):
>
> Aren't all of these equivalent to:
>
> if 5 in seq:
> ...
Yeah, but you can't do more complicated expressions that way, like
any(lambda x: x[3] == "thiskey")
I think it makes a lot of sense for any and all to take optional
predicate function arguments.
But perhaps the syntax should be:
X in SEQ
If X is a predicate function, it gets called to determine "equals"; if
an expression or other object, the normal rules apply. Of course,
then you couldn't look for a function in a set of functions...
I suppose
(len([x for x in SEQ if PRED(x)]) > 0)
will suffice for now. Obvious enough, Martin?
Bill
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
