Francis MB added the comment: A) On the example: +Also note that some operations (e.g. ``y.append(10)``/``y += [10]`` or +``y.sort()``) mutate are you saying: 1) "y.append(10)" divided by "y += [10]" or 2) "y.append(10)" and "y += [10]" I don't want to split hairs but reading it fast confused me a bit B) The paragraph: + etc.), we can use some specific operations to mutate it and all the variables + that refer to it will see + the change; Couldn't be (one newline less): + etc.), we can use some specific operations to mutate it and all the variables + that refer to it will see the change; ---------- nosy: +francismb _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue20135> _______________________________________