Géry <gery.o...@gmail.com> added the comment: Note that other relationships are always valid _and already implemented by default in the interpreter (through the `NotImplemented` return value protocol)_: = is the [converse](https://en.wikipedia.org/wiki/Binary_relation#Converse) of itself, ≠ is the converse of itself, < and > are each other’s converse, ≤ and ≥ as each other’s converse. ("converse" is loosely called "reflected" in the Python documentation.)
Which also makes me think that the last sentence of this documentation paragraph is incorrect: > By default, `__ne__()` delegates to `__eq__()` and inverts the result > unless it is `NotImplemented`. There are no other implied > relationships among the comparison operators, for example, the truth > of `(x<y or x==y)` does not imply `x<=y`. since there _are_ other implied relationships besides ≠ is the complement of =: = is the converse of itself, ≠ is the converse of itself, < and > are each other’s converse, and ≤ and ≥ are each other’s converse. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue39862> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
