Nadav Chernin wrote: > > Chris Withers wrote: > > ...becauase you were looking for: > > reversed([1,2,3,4]) > > OK, but my question is generic. Why when I use object's function that > changed values of the object, I can't to get value of it on the fly > without writing additional code? > >>>> a=[1,3,2,4] >>>> a.sort() >>>> a.reverse() >>>> a > [4, 3, 2, 1] > > Why I can't a==[1,3,2,4].sort().reverse() ?
This is a FAQ. The reasoning is that operations that modify a collection in place (the same goes for .sort()) don't return the collection to prevent errors from creeping up like this: unsorted = ... sorted = unsorted.sort() where the assumption is that unsorted is still that - unsorted. You can read a lot of the pro + cons on this NG/ML if you google for it, but you won't reach a change in semantics. Diez -- http://mail.python.org/mailman/listinfo/python-list
