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@@ -669,6 +669,11 @@ Glossary
More information can be found in :ref:`typeiter`.
+ .. impl-detail::
+
+ CPython does not consistently apply the requirement that an iterator
+ define :meth:`__iter__`.
+
key function
A key function or collation function is a callable that returns a value
used for sorting or ordering. For example, :func:`locale.strxfrm` is