diff -r cb8606fc84df Lib/test/test_memoryview.py
--- a/Lib/test/test_memoryview.py	Fri Oct 17 22:25:47 2014 -0700
+++ b/Lib/test/test_memoryview.py	Sat Oct 18 15:09:10 2014 -0700
@@ -470,6 +470,30 @@
 BaseMemorySliceSliceTests, BaseArrayMemoryTests):
 pass
 
+class ArrayFormatAllocationTest(unittest.TestCase):
+ def test_memoryview(self):
+ # create a base memoryview
+ data = bytes(range(8))
+ V = memoryview(data)
+ self.assertEquals(list(V), [0,1,2,3,4,5,6,7])
+
+ B = V.cast('H')
+ C = B[0:2]
+ D = memoryview(B)
+ del B
+
+ self.assertEquals(C[0], 256)
+ self.assertEquals(D[0], 256)
+ self.assertEquals(C.format, 'H')
+ self.assertEquals(D.format, 'H')
+
+ T = V.cast('I')
+
+ self.assertEquals(C[0], 256)
+ self.assertEquals(D[0], 256)
+ self.assertEquals(C.format, 'H')
+ self.assertEquals(D.format, 'H')
+
 
 def test_main():
 test.support.run_unittest(__name__)
diff -r cb8606fc84df Objects/memoryobject.c
--- a/Objects/memoryobject.c	Fri Oct 17 22:25:47 2014 -0700
+++ b/Objects/memoryobject.c	Sat Oct 18 15:09:10 2014 -0700
@@ -579,6 +579,15 @@
 view->len = len;
 }
 
+Py_LOCAL_INLINE(void)
+init_format(PyMemoryViewObject *mv, char *format)
+{
+ strncpy(mv->format, format ? format : "B",
+ _Py_MEMORYVIEW_MAX_FORMAT);
+ mv->format[_Py_MEMORYVIEW_MAX_FORMAT - 1] = '0円';
+ mv->view.format = mv->format;
+}
+
 /* Initialize memoryview buffer properties. */
 static void
 init_flags(PyMemoryViewObject *mv)
@@ -669,8 +678,10 @@
 init_shared_values(dest, src);
 init_shape_strides(dest, src);
 init_suboffsets(dest, src);
+ init_format(mv, src->format);
 init_flags(mv);
 
+
 mv->mbuf = mbuf;
 Py_INCREF(mbuf);
 mbuf->exports++;
@@ -878,6 +889,9 @@
 /* flags */
 init_flags(mv);
 
+ /* format */
+ init_format(mv, src->format);
+
 if (copy_buffer(dest, src) < 0) { Py_DECREF(mv); return NULL; @@ -892,7 +906,7 @@ The logical structure of the input and output buffers is the same (i.e. tolist(input) == tolist(output)), but the physical layout in memory can be explicitly chosen. - + As usual, if buffertype=PyBUF_WRITE, the exporter's buffer must be writable, otherwise it may be writable or read-only. @@ -1181,10 +1195,7 @@ goto out; } - strncpy(mv->format, PyBytes_AS_STRING(asciifmt),
- _Py_MEMORYVIEW_MAX_FORMAT);
- mv->format[_Py_MEMORYVIEW_MAX_FORMAT-1] = '0円';
- view->format = mv->format;
+ init_format(mv, PyBytes_AS_STRING(asciifmt));
 view->itemsize = itemsize;
 
 view->ndim = 1;
@@ -1193,7 +1204,7 @@
 view->suboffsets = NULL;
 
 init_flags(mv);
- 
+
 ret = 0;
 
 out:
@@ -2240,7 +2251,7 @@
 {
 Py_buffer *view;
 view = &(self->view);
- 
+
 CHECK_RELEASED(self);
 
 if (view->ndim == 0) {
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