Serhiy Storchaka <[email protected]> added the comment:
No.
First, it is impossible. nb_bool and PyObject_IsTrue() can return only three
value: 1 for true, 0 for false, and -1 for error. It is not possible to
represent NotImplemented without breaking all extensions.
Currently
if not a:
b()
else:
c()
is equivalent to
if a:
c()
else:
b()
If a is NotImplemented, what branch be executed in every case?
Second, it would not help. Because real-world examples are not always so
trivial as "return not self.__lt__(other)". It may be a part of more complex
expression, e.g.:
return super().__eq__(other) and self.attr == other.attr
So it may help in some examples, but make bugs in other examples even more
mystical.
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<https://bugs.python.org/issue35712>
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