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Issue #15944: memoryview: Allow arbitrary formats when casting to bytes.

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Original patch by Martin Panter.
This commit is contained in:
Stefan Krah 2015-08-08 13:38:10 +02:00
parent 917c2c3654
commit 0c51595a78
5 changed files with 57 additions and 11 deletions
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29
Lib/test/test_buffer.py
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@ -2559,8 +2559,7 @@ class TestBufferProtocol(unittest.TestCase):
ex = ndarray(sitems, shape=[1], format=sfmt)
msrc = memoryview(ex)
for dfmt, _, _ in iter_format(1):
if (not is_memoryview_format(sfmt) or
not is_memoryview_format(dfmt)):
if not is_memoryview_format(dfmt):
self.assertRaises(ValueError, msrc.cast, dfmt,
[32//dsize])
else:
@ -2773,6 +2772,32 @@ class TestBufferProtocol(unittest.TestCase):
ndim=ndim, shape=shape, strides=strides,
lst=lst, cast=True)
if ctypes:
# format: "T{>l:x:>d:y:}"
class BEPoint(ctypes.BigEndianStructure):
_fields_ = [("x", ctypes.c_long), ("y", ctypes.c_double)]
point = BEPoint(100, 200.1)
m1 = memoryview(point)
m2 = m1.cast('B')
self.assertEqual(m2.obj, point)
self.assertEqual(m2.itemsize, 1)
self.assertEqual(m2.readonly, 0)
self.assertEqual(m2.ndim, 1)
self.assertEqual(m2.shape, (m2.nbytes,))
self.assertEqual(m2.strides, (1,))
self.assertEqual(m2.suboffsets, ())
x = ctypes.c_double(1.2)
m1 = memoryview(x)
m2 = m1.cast('c')
self.assertEqual(m2.obj, x)
self.assertEqual(m2.itemsize, 1)
self.assertEqual(m2.readonly, 0)
self.assertEqual(m2.ndim, 1)
self.assertEqual(m2.shape, (m2.nbytes,))
self.assertEqual(m2.strides, (1,))
self.assertEqual(m2.suboffsets, ())
def test_memoryview_tolist(self):
# Most tolist() tests are in self.verify() etc.