diff -r f4c6dab59cd8 Doc/library/collections.abc.rst
--- a/Doc/library/collections.abc.rst	Tue Apr 26 17:04:18 2016 +0200
+++ b/Doc/library/collections.abc.rst	Fri Aug 19 09:14:02 2016 -0400
@@ -45,9 +45,9 @@
 :class:`Sized`                                    ``__len__``
 :class:`Callable`                                 ``__call__``
 
-:class:`Sequence`          :class:`Sized`,        ``__getitem__``,        ``__contains__``, ``__iter__``, ``__reversed__``,
-                           :class:`Reversible`,   ``__len__``             ``index``, and ``count``
-                           :class:`Container`
+:class:`Sequence`          :class:`Sized`,        ``__getitem__``,        ``__eq__``, ``__ne__``, ``__contains__``,
+                           :class:`Reversible`,   ``__len__``             ``__iter__``, ``__reversed__``, ``index``,
+                           :class:`Container`                             and ``count``
 
 :class:`MutableSequence`   :class:`Sequence`      ``__getitem__``,        Inherited :class:`Sequence` methods and
                                                   ``__setitem__``,        ``append``, ``reverse``, ``extend``, ``pop``,
diff -r f4c6dab59cd8 Lib/_collections_abc.py
--- a/Lib/_collections_abc.py	Tue Apr 26 17:04:18 2016 +0200
+++ b/Lib/_collections_abc.py	Fri Aug 19 09:14:02 2016 -0400
@@ -823,6 +823,12 @@
 
     __slots__ = ()
 
+    def __eq__(self, other):
+        if not isinstance(other, Sequence):
+            return NotImplemented
+        return (len(self) == len(other)
+                and all(a == b for a, b in zip(self, other)))
+
     @abstractmethod
     def __getitem__(self, index):
         raise IndexError
diff -r f4c6dab59cd8 Lib/test/test_collections.py
--- a/Lib/test/test_collections.py	Tue Apr 26 17:04:18 2016 +0200
+++ b/Lib/test/test_collections.py	Fri Aug 19 09:14:02 2016 -0400
@@ -1316,6 +1316,12 @@
             nativeseq = ty('abracadabra')
             indexes = [-10000, -9999] + list(range(-3, len(nativeseq) + 3))
             seqseq = SequenceSubclass(nativeseq)
+
+            # Test __eq__ and __ne__.
+            self.assertEqual(seqseq, nativeseq)
+            self.assertNotEqual(seqseq, "hocus pocus")
+
+            # Test index.
             for letter in set(nativeseq) | {'z'}:
                 assert_index_same(nativeseq, seqseq, (letter,))
                 for start in range(-3, len(nativeseq) + 3):