Whoa! Do Python and Lisp really have LAMBDA ?
Karl A. Krueger
kkrueger at example.edu
Mon Oct 27 17:02:20 CET 2003
In comp.lang.lisp Marco Antoniotti <marcoxa at cs.nyu.edu> wrote:
> Common Lisp does it right.
> (mapcar (lambda (f) (funcall f 1))
> (mapcar (lambda (i)
> (lambda (x) (+ x i)))
> (list 1 2 3)))
> ... This is what the Haskell code eventually boild down to.
> It is Python that apparently cannot do this. But, in all fairness,
> nowhere in Python there is a claim that lambda expressions are full fledged.
Python lambda isn't *that* limited. It's just that the equivalent is
rather ugly by Python standards:
[f(1) for f in
[(lambda i: lambda x: x + i)(y)
for y in [1, 2, 3]]]
This also works, but isn't any prettier:
map(lambda f: apply(f, (1,)),
lambda x: (x + i),
[1, 2, 3]))
(Bleah. All those colons and commas are giving me MPI flashbacks.)
Karl A. Krueger <kkrueger at example.edu>
Woods Hole Oceanographic Institution
Email address is spamtrapped. s/example/whoi/
"Outlook not so good." -- Magic 8-Ball Software Reviews
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