On Sunday, December 4, 2016 at 1:59:00 PM UTC-6, Frédéric Chapoton wrote: > > There is currently an effort being made (by me and a few referees) to get > rid of cmp() in all pyx files. And the Element/Parent is one of the hardest > cases remaining. Getting rid of all calls to cmp( ) is necessary for > compatibility with python3. The intermediate objective is to be able to > compile all cython files with py3. So at some point I am going to try to > handle the very same problem your are asking about. > > richcmp, when not knowing what to do, should most probably return > NotImplemented > > We need to be very careful about defining "not knowing". I (stongly) believe when the objects/types are incomparable (say the rings ZZ and QQ), then == should return False and != should return True. Subsequently, when there is no coercion between the parents, they should not raise an error.
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