Issue #16148: Small improvements and cleanup. Added version information
to docs.
diff --git a/Doc/library/operator.rst b/Doc/library/operator.rst
index 93f33ff..1cd87fc 100644
--- a/Doc/library/operator.rst
+++ b/Doc/library/operator.rst
@@ -241,6 +241,8 @@
actual length, then an estimate using ``__length_hint__``, and finally
returning the default value.
+ .. versionadded:: 3.4
+
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