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Issue #15814: Use hash function that is compatible with the equality

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definition from #15573.
This commit is contained in:
Stefan Krah 2012-11-02 17:49:22 +01:00
parent e6996ed5d9
commit 4af77a0276
3 changed files with 38 additions and 8 deletions
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32
Lib/test/test_buffer.py
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@ -3999,14 +3999,42 @@ class TestBufferProtocol(unittest.TestCase):
m = memoryview(x)
self.assertEqual(hash(m), hash(x))
# equality-hash invariant
x = ndarray(list(range(12)), shape=[12], format='B')
a = memoryview(nd)
y = ndarray(list(range(12)), shape=[12], format='b')
b = memoryview(nd)
z = ndarray(list(bytes(chr(x), 'latin-1') for x in range(12)),
shape=[12], format='c')
c = memoryview(nd)
if (a == b):
self.assertEqual(hash(a), hash(b))
if (a == c):
self.assertEqual(hash(a), hash(c))
if (b == c):
self.assertEqual(hash(b), hash(c))
# non-byte formats
nd = ndarray(list(range(12)), shape=[2,2,3], format='L')
m = memoryview(nd)
self.assertEqual(hash(m), hash(nd.tobytes()))
self.assertRaises(ValueError, m.__hash__)
nd = ndarray(list(range(-6, 6)), shape=[2,2,3], format='h')
m = memoryview(nd)
self.assertEqual(hash(m), hash(nd.tobytes()))
self.assertRaises(ValueError, m.__hash__)
nd = ndarray(list(range(12)), shape=[2,2,3], format='= L')
m = memoryview(nd)
self.assertRaises(ValueError, m.__hash__)
nd = ndarray(list(range(-6, 6)), shape=[2,2,3], format='< h')
m = memoryview(nd)
self.assertRaises(ValueError, m.__hash__)
def test_memoryview_release(self):