Update docs for collections ABCs and for collections.UserDict.
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 0be8d07..d218a9b 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -32,25 +32,32 @@
:class:`collections.Iterable` Defines ``__iter__()``
:class:`collections.Iterator` Derived from :class:`Iterable` and in
addition defines ``__next__()``
+:class:`collections.Sized` Defines ``__len__()``
:class:`collections.Mapping` Derived from :class:`Container`,
:class:`Iterable`,
and :class:`Sized`, and in addition
defines ``__getitem__()``, ``get()``,
``__contains__()``, ``__len__()``,
+ ``__eq__()``, ``__ne__()``,
``__iter__()``, ``keys()``,
``items()``, and ``values()``
:class:`collections.MutableMapping` Derived from :class:`Mapping`
-:class:`collections.MutableSequence` Derived from :class:`Sequence`
-:class:`collections.MutableSet` Derived from :class:`Set` and in
- addition defines ``add()``,
- ``clear()``, ``discard()``, ``pop()``,
- and ``toggle()``
:class:`collections.Sequence` Derived from :class:`Container`,
:class:`Iterable`, and :class:`Sized`,
and in addition defines
- ``__getitem__()``
-:class:`collections.Set` Derived from :class:`Container`, :class:`Iterable`, and :class:`Sized`
-:class:`collections.Sized` Defines ``__len__()``
+ ``__getitem__()`
+:class:`collections.MutableSequence` Derived from :class:`Sequence`
+:class:`collections.Set` Derived from :class:`Container`, :class:`Iterable`, :class:`Sized`.
+ add in addition defines
+ ``__le__()``, ``__lt__()``, ``__eq__()``,
+ ``__and__()``, ``__or__()``, ``__sub__()``,
+ ``__xor__()``, and ``isdisjoint()``,
+:class:`collections.MutableSet` Derived from :class:`Set` and in
+ addition defines ``add()``,
+ ``clear()``, ``discard()``, ``pop()``,
+ ``remove()``, ``__ior__()``, ``__iand__()``,
+ ``__ixor__()``, and ``__isub__()``
+
===================================== ========================================
.. XXX Have not included them all and the notes are incomplete
@@ -577,3 +584,30 @@
.. [#] For information on the double-star-operator see
:ref:`tut-unpacking-arguments` and :ref:`calls`.
+
+
+
+:class:`UserDict` objects
+----------------------
+
+The class, :class:`UserDict` acts as a wrapper around dictionary objects.
+The need for this class has been partially supplanted by the ability to
+subclass directly from :class:`dict`; however, this class can be easier
+to work with because the underlying dictionary is accessible as an
+attribute.
+
+.. class:: UserDict([initialdata])
+
+ Class that simulates a dictionary. The instance's contents are kept in a
+ regular dictionary, which is accessible via the :attr:`data` attribute of
+ :class:`UserDict` instances. If *initialdata* is provided, :attr:`data` is
+ initialized with its contents; note that a reference to *initialdata* will not
+ be kept, allowing it be used for other purposes.
+
+In addition to supporting the methods and operations of mappings,
+:class:`UserDict` and :class:`IterableUserDict` instances
+provide the following attribute:
+
+.. attribute:: UserDict.data
+
+ A real dictionary used to store the contents of the :class:`UserDict` class.