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Issue #9757: memoryview objects get a release() method to release the

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underlying buffer (previously this was only done when deallocating the
memoryview), and gain support for the context management protocol.
This commit is contained in:
Antoine Pitrou 2010-09-09 12:59:39 +00:00
parent bad3c88094
commit 6e6cc830c4
4 changed files with 158 additions and 11 deletions
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45
Lib/test/test_memoryview.py
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@ -225,6 +225,51 @@ class AbstractMemoryTests:
gc.collect()
self.assertTrue(wr() is None, wr())
def _check_released(self, m, tp):
check = self.assertRaisesRegexp(ValueError, "released")
with check: bytes(m)
with check: m.tobytes()
with check: m.tolist()
with check: m[0]
with check: m[0] = b'x'
with check: len(m)
with check: m.format
with check: m.itemsize
with check: m.ndim
with check: m.readonly
with check: m.shape
with check: m.strides
with check:
with m:
pass
# str() and repr() still function
self.assertIn("released memory", str(m))
self.assertIn("released memory", repr(m))
self.assertEqual(m, m)
self.assertNotEqual(m, memoryview(tp(self._source)))
self.assertNotEqual(m, tp(self._source))
def test_contextmanager(self):
for tp in self._types:
b = tp(self._source)
m = self._view(b)
with m as cm:
self.assertIs(cm, m)
self._check_released(m, tp)
m = self._view(b)
# Can release explicitly inside the context manager
with m:
m.release()
def test_release(self):
for tp in self._types:
b = tp(self._source)
m = self._view(b)
m.release()
self._check_released(m, tp)
# Can be called a second time (it's a no-op)
m.release()
self._check_released(m, tp)
# Variations on source objects for the buffer: bytes-like objects, then arrays
# with itemsize > 1.