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[Python-ideas] suggestion about the sort() function of the list instance
qhlonlineqhlonline at 163.com
Tue Feb 28 20:31:43 EST 2017
My code example is not proper, Yes, may be this is better: list.sort().revers().Other languages do this differently. JavaScript may return the sorted, while C++ STL returns nothing.I think that it maybe more important to let user have good knowledge about this function then to have fluent code on some occasions. I prefer to draw back this suggestion. Regards！At 2017-03-01 08:13:39, "Steven D'Aprano" <steve at pearwood.info> wrote:>On Mon, Feb 27, 2017 at 11:07:33AM +0800, qhlonline wrote:>> Hi, all>> I have a suggestion that, the sort() member method of the list>> instance, should return the 'self' as the result of list.sort()>> call.>>Having list.sort() and list.reverse() return self is a perfectly good>design. The advantage is you can write things like this:>>list.sort().reverse()>>but the disadvantage is that it may fool people into thinking it returns>a *copy* of the list. Python avoids that trap by returning None, so that>you cannot write:>>sorted_items = items.sort()>>but instead people write:>>items = items.sort()>>so it seems that whatever we do, it will confuse some people.>>>> Now list.sort() returns nothing, so that I can NOT write>> code like this:>>>> res = {item: func(item) for item in item_list.sort()}>>What is the purpose of the sort? Because dicts are unordered, the>results will be no different if you just write:>> d = {item: func(item) for item in item_list}>>>-->Steve>_______________________________________________>Python-ideas mailing list>Python-ideas at python.org>https://mail.python.org/mailman/listinfo/python-ideas>Code of Conduct:http://python.org/psf/codeofconduct/-------------- next part --------------An HTML attachment was scrubbed...URL: <http://mail.python.org/pipermail/python-ideas/attachments/20170301/7c6e6d27/attachment-0001.html>
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