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-rw-r--r--Doc/reference/datamodel.rst9
1 files changed, 9 insertions, 0 deletions
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 8b127a0b7e..26ad7b8c05 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -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