On Wed, 2006-05-03 at 14:00 +0200, Igor wrote: > Hi. > > And I thought I understood python pretty well. Until I got hit by this: > > >>> def f(x): > ... print x > > >>> cb = [lambda :f(what) for what in "1234"] > >>> for c in cb:c() > 4 > 4 > 4 > 4
>>> cb = [(lambda x=what:f(x)) for what in "1234"] >>> cb[0]() 1 A variable from the enclosing scope is normally only evaluated when used, that is when the closure is called. To capture a "transient" value, you need to explicitly pass it into the closure. I've gotten burned on this more than once. (snipped) > Regards, > Igor > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor -- Lloyd Kvam Venix Corp. 1 Court Street, Suite 378 Lebanon, NH 03766-1358 voice: 603-653-8139 fax: 320-210-3409 -- Lloyd Kvam Venix Corp _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
