Issue #16148: implemented PEP 424
diff --git a/Doc/library/operator.rst b/Doc/library/operator.rst
index 3860880..93f33ff 100644
--- a/Doc/library/operator.rst
+++ b/Doc/library/operator.rst
@@ -235,6 +235,12 @@
.. XXX: find a better, readable, example
+.. function:: length_hint(obj, default=0)
+
+ Return an estimated length for the object *o*. First trying to return its
+ actual length, then an estimate using ``__length_hint__``, and finally
+ returning the default value.
+
The :mod:`operator` module also defines tools for generalized attribute and item
lookups. These are useful for making fast field extractors as arguments for
:func:`map`, :func:`sorted`, :meth:`itertools.groupby`, or other functions that