On Thu, Jul 10, 2008 at 2:26 PM, Raymond Hettinger <[EMAIL PROTECTED]> wrote: > When exercising 2-to-3 on Zodb at the EuroPython sprints, we also found > another oddity. This code works in 2.6 but fails in 3.0 (it looks for the > free variable in the global scope instead of the enclosing local scope): > > class A(object): > v = 8 > x = [v for i in range(6)]
This is in a sense not new, and I believe we decided not to do anything about it. You can get the same error in 2.6 by using a genexp instead of a listcomp, like this: class A: v = 8 x = list(v for i in range(6)) The new failure in 3.0 is a side effect of the translation (mostly) of list comps into genexps. The underlying problem is that the genexp creates a function scope, and function scopes don't have access to the surrounding class body scope. (There's a really good but extremely subtle reason for that.) I think there are old threads about this. -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-3000 mailing list Python-3000@python.org http://mail.python.org/mailman/listinfo/python-3000 Unsubscribe: http://mail.python.org/mailman/options/python-3000/archive%40mail-archive.com
