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[3.14] gh-89152: Note truth testing exception in stdtypes.rst (GH-137640) (#143081)

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gh-89152: Note truth testing exception in `stdtypes.rst` (GH-137640)
(cherry picked from commit 3c0888b25b)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
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Doc/library/stdtypes.rst
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@ -46,8 +46,10 @@ Any object can be tested for truth value, for use in an :keyword:`if` or
By default, an object is considered true unless its class defines either a
:meth:`~object.__bool__` method that returns ``False`` or a
:meth:`~object.__len__` method that
returns zero, when called with the object. [1]_ Here are most of the built-in
objects considered false:
returns zero, when called with the object. [1]_ If one of the methods raises an
exception when called, the exception is propagated and the object does
not have a truth value (for example, :data:`NotImplemented`).
Here are most of the built-in objects considered false:
.. index::
single: None (Built-in object)