New submission from Terry J. Reedy: The Tutorial section More on Lists https://docs.python.org/3.4/tutorial/datastructures.html#more-on-lists includes list.pop but ignores it in the example and final comment. I think the examples should be augmented and the comment modified.
1. (simplest) End the example block with >>> a.pop() 1234.5 >>> a [-1, 1, 66.25, 333, 333] 2. The comment says "You might have noticed that methods like insert, remove or sort that modify the list have no return value printed – they return None. [1] This is a design principle for all mutable data structures in Python." [The footnote says "[1] Other languages may return the mutated object, which allows method chaining, such as d->insert("a")->remove("b")->sort();."] Inserting 'only' before 'modify' makes the statement true even now with .pop added. I think 'the default' should be added before 'None', but that would be optional. I do not think .pop needs to be explicitly mentioned here since the point of the comment is to explain the lack of a printed return value, and .pop does have a printed return value. ---------- assignee: docs@python components: Documentation messages: 218857 nosy: docs@python, ncoghlan, terry.reedy priority: normal severity: normal stage: needs patch status: open title: Tutorial: examples and comment about mutation methods type: behavior versions: Python 2.7, Python 3.4, Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue21545> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com