On Mon, 23 Aug 2010 07:48:03 am Denis Gomes wrote: > Nick, > > If you are using python 2.X, xrange(2,n) is just like range(2,n), > the xrange function is faster. In python 3.X, they got rid of the > slower range function and renamed xrange to range.
A slight over-simplification, but broadly correct. > The x in [x for x > in xrange...] will just go from 2 to the number n, but not including > n. I see people using list comprehensions like this: [x for x in xrange(20)] # for example quite frequently. I've even done it myself. But it's silly and wasteful. That is exactly the same, only slower and more complicated, as: list(xrange(20)) or range(20) Any time you write [x for x in SOMETHING] just drop the list comprehension and use SOMETHING on it's own. (You might need to call list(SOMETHING), but often you don't.) -- Steven D'Aprano _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
