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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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21
Lib/test/test_memoryview.py
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@ -492,5 +492,26 @@ class ArrayMemorySliceSliceTest(unittest.TestCase,
pass
class OtherTest(unittest.TestCase):
def test_ctypes_cast(self):
# Issue 15944: Allow all source formats when casting to bytes.
ctypes = test.support.import_module("ctypes")
p6 = bytes(ctypes.c_double(0.6))
d = ctypes.c_double()
m = memoryview(d).cast("B")
m[:2] = p6[:2]
m[2:] = p6[2:]
self.assertEqual(d.value, 0.6)
for format in "Bbc":
with self.subTest(format):
d = ctypes.c_double()
m = memoryview(d).cast(format)
m[:2] = memoryview(p6).cast(format)[:2]
m[2:] = memoryview(p6).cast(format)[2:]
self.assertEqual(d.value, 0.6)
if __name__ == "__main__":
unittest.main()