On 1/27/20 5:01 PM, Nils Bruin wrote: > This came up in https://trac.sagemath.org/ticket/29042 : > In current IPython, dictionaries are no longer sorted on output, because > in Py3 there is a slightly more meaningful order to the dict: it's close > to insertion order. So it seems reasonable to follow this order for > printing too. > Yet, the order in not actually intrinsically meaningful for the dict. > We have previously relied on the sorting of dictionaries to make > doctests of dictionaries work smoothly. We need to change that if we > upgrade IPython. There seem to be two main options: > 1) we adjust the doctests to the new output order of IPython > 2) we adjust the doctests so that the output order is somehow sorted. > > The problem with 1) is that it's a nasty change (it hits quite a few > doctests), and it's rather fundamentally fragile: if some code changes > somewhere (or, unlikely, Py3 changes dict ordering), doctests break again. >
The insertion order is part of the language as of python-3.7, and can't be changed: * https://mail.python.org/pipermail/python-dev/2017-December/151283.html * https://docs.python.org/3.7/tutorial/datastructures.html#dictionaries So while it sucks, I guess we should update all of the doctests to print in that order. It was always a bad idea to rely on them being sorted, and I don't think I agree with making the order part of the language, but that's what we've got. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-devel/da4e4249-068d-af9d-7f3a-813134f50e55%40orlitzky.com.
