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bpo-35712: Make using NotImplemented in a boolean context issue a deprecation warning (GH-13195)

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MojoVampire 2020-03-03 18:50:17 +00:00 • committed by GitHub
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Doc/reference/datamodel.rst
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@ -156,13 +156,18 @@ NotImplemented
object is accessed through the built-in name ``NotImplemented``. Numeric methods
and rich comparison methods should return this value if they do not implement the
operation for the operands provided. (The interpreter will then try the
reflected operation, or some other fallback, depending on the operator.) Its
truth value is true.
reflected operation, or some other fallback, depending on the operator.) It
should not be evaluated in a boolean context.
See
:ref:`implementing-the-arithmetic-operations`
for more details.
.. versionchanged:: 3.9
Evaluating ``NotImplemented`` in a boolean context is deprecated. While
it currently evaluates as true, it will emit a :exc:`DeprecationWarning`.
It will raise a :exc:`TypeError` in a future version of Python.
Ellipsis
.. index::