> Alex: > > We are indeed sure (sadly) that list comprehensions leak control > > variable names. > > Guido: > > But they shouldn't. It can be fixed by renaming them (e.g. numeric > > names with a leading dot). > > Aahz: > > ?!?! When listcomps were introduced, you were strongly against [...] > > Are you changing your position[...]? > > Guido: > > Did I say it was a feature that > > > > L = [x for x in R] > > print x > > > > would print the last item of R? > > Well, I don't care much about the history of what you may have said... > let's get it out in the open: The fact that listcomps leak their > variable (thus providing a handy name-binding expression for the evil-minded > among us) is a BAD THING. > > I'd love to see that (mis)feature removed someday. I'd love to have that > made possible by Guido's _immediately_ and _officially_ declaring it to be > an unsupported (and deprecated) feature. Make it so. > Then maybe *someday* we could > get rid of them. Even now, people are writing code that (ab)uses this, > and making it ever harder to ever change this in the future. --Guido van Rossum (home page: http://www.python.org/~guido/)
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