Tim Peters <t...@python.org> added the comment:
So as far as possible, CPython only uses __lt__ ("<") element comparisons for
its order-sensitive algorithms. This is documented for list.sort(), but the
bisect and heapq modules strive to do the same.
The point is to minimize the number of comparison methods a new type needs to
implement to participate (and "just one: __lt__" is ideal).
Your change would require they implement "__le__" too, so is unlikely to be
accepted for CPython.
----------
assignee: rhettinger ->
nosy: +tim.peters -rhettinger
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38626>
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