mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-10-06 15:11:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 10

Issue #19014: memoryview.cast() is now allowed on zero-length views.

Browse source
This commit is contained in:
Antoine Pitrou 2013-10-03 19:55:41 +02:00
parent def0a4c298
commit 60b183407c
3 changed files with 13 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

13
Lib/test/test_buffer.py
View file

@ -2432,15 +2432,22 @@ class TestBufferProtocol(unittest.TestCase):
self.assertRaises(ValueError, get_contiguous, nd[::-1], PyBUF_READ, 'C')
def test_memoryview_cast_zero_shape(self):
# Casts are undefined if shape contains zeros. These arrays are
# regarded as C-contiguous by Numpy and PyBuffer_GetContiguous(),
# so they are not caught by the test for C-contiguity in memory_cast().
# Casts are undefined if buffer is multidimensional and shape
# contains zeros. These arrays are regarded as C-contiguous by
# Numpy and PyBuffer_GetContiguous(), so they are not caught by
# the test for C-contiguity in memory_cast().
items = [1,2,3]
for shape in ([0,3,3], [3,0,3], [0,3,3]):
ex = ndarray(items, shape=shape)
self.assertTrue(ex.c_contiguous)
msrc = memoryview(ex)
self.assertRaises(TypeError, msrc.cast, 'c')
# Monodimensional empty view can be cast (issue #19014).
for fmt, _, _ in iter_format(1, 'memoryview'):
msrc = memoryview(b'')
m = msrc.cast(fmt)
self.assertEqual(m.tobytes(), b'')
self.assertEqual(m.tolist(), [])
def test_memoryview_struct_module(self):