Close #18690: register memoryview with Sequence ABC

Doc/library/stdtypes.rst

@@ -2458,6 +2458,10 @@ copying.
    .. versionchanged:: 3.3
       One-dimensional memoryviews with formats 'B', 'b' or 'c' are now hashable.
 
+   .. versionchanged:: 3.4
+      memoryview is now registered automatically with
+      :class:`collections.abc.Sequence`
+
    :class:`memoryview` has several methods:
 
    .. method:: __eq__(exporter)

Lib/collections/abc.py

@@ -643,6 +643,7 @@ class Sequence(Sized, Iterable, Container):
 Sequence.register(tuple)
 Sequence.register(str)
 Sequence.register(range)
+Sequence.register(memoryview)
 
 
 class ByteString(Sequence):

Lib/test/test_collections.py

@@ -782,6 +782,8 @@ class TestCollectionABCs(ABCTestCase):
             self.assertTrue(issubclass(sample, Sequence))
         self.assertIsInstance(range(10), Sequence)
         self.assertTrue(issubclass(range, Sequence))
+        self.assertIsInstance(memoryview(b""), Sequence)
+        self.assertTrue(issubclass(memoryview, Sequence))
         self.assertTrue(issubclass(str, Sequence))
         self.validate_abstract_methods(Sequence, '__contains__', '__iter__', '__len__',
             '__getitem__')

Misc/NEWS

@@ -10,6 +10,9 @@ Projected release date: 2013-10-20
 Core and Builtins
 -----------------
 
+- Issue #18690: memoryview is now automatically registered with
+  collections.abc.Sequence
+
 - Issue #19078: memoryview now correctly supports the reversed builtin
   (Patch by Claudiu Popa)