Giovanni Bajo wrote: >>>>a = [] >>>>for i in range(10): > > ... a.append(lambda: i) > ... > >>>>print [x() for x in a] > > [9, 9, 9, 9, 9, 9, 9, 9, 9, 9] > > This subtle semantic of lambda is quite confusing, and still forces people to > use the "i=i" trick.
This has *nothing* to do with the semantics of lambda! It's because Python's for-loop doesn't put its control variable in a new scope, the way Scheme's equivalent construct does. *That's* what needs to be addressed to fix this problem. I've made a suggestion about that before, but Guido rejected it, so I won't repeat it here. -- Greg _______________________________________________ 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
