In article <mailman.2007.1341988993.4697.python-l...@python.org>, Daniel Fetchinson <fetchin...@googlemail.com> wrote:
> > funcs = [ lambda x: x**i for i in range( 5 ) ] > > print funcs[0]( 2 ) > > print funcs[1]( 2 ) > > print funcs[2]( 2 ) > > > > This gives me > > > > 16 > > 16 > > 16 > > > > When I was excepting > > > > 1 > > 2 > > 4 > > > > Does anyone know why? In Python 3.x : funcs = [lambda x: x**i for i in range(5)] list(map(lambda f: f(2),funcs)) --> [16, 16, 16, 16, 16] Ooops, cool semantics :-) In Racket Scheme (http://racket-lang.org), they seem to know lambdas : #lang racket ;;; quick and dirty list comprehension syntax as a macro, for fun : (define-syntax-rule (list-of expr for x in L) (map (lambda (x) expr) L)) (list-of (sqr x) for x in (range 5)) --> (0 1 4 9 16) (define funcs (list-of (lambda (x) (expt x i)) for i in (range 5))) (map (lambda (f) (f 2)) funcs) --> (1 2 4 8 16) franck -- http://mail.python.org/mailman/listinfo/python-list
