Dear All, You are all completely right. Sorry for the confusion. Thank you all very much for putting my mind right about this issue. Best Regards Raymond Bisdorff
> On 30 Oct 2021, at 19:00, Tim Peters <tim.pet...@gmail.com> wrote: > > [Raymond Bisdorff <raymond.bisdo...@pt.lu>] >> I fully agree with your point. By default, all the components of the >> tuple should be used in the comparison. >> >> Yet, I was confused by the following result. >>>>> from operator import itemgetter >>>>> L = [(1, 'a'), (2, 'b'), (1, 'c'), (2, 'd'), (3, 'e')] >>>>> L.sort(key=itemgetter(0), reverse=True) >>>>> L = [(3, 'e'), (2, 'd'), (2, 'b'), (1, 'c'), (1, 'a')] >> >> Should the tuples comparison is in this case, I thought, not be solely >> based on the first tuple component? > > I'm not sure what you're doing there. The last line in your example > isn't showing the result of sorting, it's assigning a brand new list > to `L`' Here the same thing, but changing the last line to show the > result of sorting: > >>>> from operator import itemgetter >>>> L = [(1, 'a'), (2, 'b'), (1, 'c'), (2, 'd'), (3, 'e')] >>>> L.sort(key=itemgetter(0), reverse=True) >>>> L > [(3, 'e'), (2, 'b'), (2, 'd'), (1, 'a'), (1, 'c')] > > So stability does matter when comparing only the tuples' first > components, and tuples with the same first component did retain their > original order. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/WI3E6UFVJMIK6UBXWLA4HLHQ4IVFZDNN/ Code of Conduct: http://python.org/psf/codeofconduct/
