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@@ -783,6 +783,14 @@ Glossary
mapping rather than a sequence because the lookups use arbitrary
:term:`immutable` keys rather than integers.
+ The :class:`collections.abc.Sequence` abstract base class
+ defines a much richer interface that goes beyond just
+ :meth:`__getitem__` and :meth:`__len__`, adding :meth:`count`,
+ :meth:`index`, :meth:`__contains__`, and
+ :meth:`__reversed__`. Types that implement this expanded
+ interface can be registered explicitly using
+ :func:`~abc.register`.
+
single dispatch
A form of :term:`generic function` dispatch where the implementation is
chosen based on the type of a single argument.