- Issue #10181: New memoryview implementation fixes multiple ownership

and lifetime issues of dynamically allocated Py_buffer members (#9990)
  as well as crashes (#8305, #7433). Many new features have been added
  (See whatsnew/3.3), and the documentation has been updated extensively.
  The ndarray test object from _testbuffer.c implements all aspects of
  PEP-3118, so further development towards the complete implementation
  of the PEP can proceed in a test-driven manner.

  Thanks to Nick Coghlan, Antoine Pitrou and Pauli Virtanen for review
  and many ideas.

- Issue #12834: Fix incorrect results of memoryview.tobytes() for
  non-contiguous arrays.

- Issue #5231: Introduce memoryview.cast() method that allows changing
  format and shape without making a copy of the underlying memory.

setup.py

@@ -530,6 +530,8 @@ class PyBuildExt(build_ext):
         # Python C API test module
         exts.append( Extension('_testcapi', ['_testcapimodule.c'],
                                depends=['testcapi_long.h']) )
+        # Python PEP-3118 (buffer protocol) test module
+        exts.append( Extension('_testbuffer', ['_testbuffer.c']) )
         # profiler (_lsprof is for cProfile.py)
         exts.append( Extension('_lsprof', ['_lsprof.c', 'rotatingtree.c']) )
         # static Unicode character database