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bpo-26701: Add documentation for __trunc__ (GH-6049)

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`int` fails back to `__trunc__` is `__int__` isn't defined, so cover
that in the docs.
(cherry picked from commit 308eab979d)

Co-authored-by: Eric Appelt <eric.appelt@gmail.com>
This commit is contained in:
Miss Islington (bot) 2018-03-10 07:10:32 -08:00 • committed by Nick Coghlan
parent 6826589415
commit f34e0d60e2
3 changed files with 15 additions and 3 deletions
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9
Doc/reference/datamodel.rst
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@ -2377,6 +2377,15 @@ left undefined.
of the appropriate type.
.. method:: object.__trunc__(self)
Called to implement :meth:`math.trunc`. Should return the value of the
object truncated to a :class:`numbers.Integral` (typically an
:class:`int`). If a class defines :meth:`__trunc__` but not
:meth:`__int__`, then :meth:`__trunc__` is called to implement the
built-in function :func:`int`.
.. method:: object.__index__(self)
Called to implement :func:`operator.index`, and whenever Python needs to