test_array.py 文件源码

def test_buffer(self):
        a = array.array(self.typecode, self.example)
        m = memoryview(a)
        expected = m.tobytes()
        self.assertEqual(a.tobytes(), expected)
        self.assertEqual(a.tobytes()[0], expected[0])
        # Resizing is forbidden when there are buffer exports.
        # For issue 4509, we also check after each error that
        # the array was not modified.
        if support.check_impl_detail(pypy=True):
            # PyPy export buffers differently, and allows reallocation
            # of the underlying object.
            return
        self.assertRaises(BufferError, a.append, a[0])
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, a.extend, a[0:1])
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, a.remove, a[0])
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, a.pop, 0)
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, a.fromlist, a.tolist())
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, a.frombytes, a.tobytes())
        self.assertEqual(m.tobytes(), expected)
        if self.typecode == 'u':
            self.assertRaises(BufferError, a.fromunicode, a.tounicode())
            self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, operator.imul, a, 2)
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, operator.imul, a, 0)
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, operator.setitem, a, slice(0, 0), a)
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, operator.delitem, a, 0)
        self.assertEqual(m.tobytes(), expected)
        self.assertRaises(BufferError, operator.delitem, a, slice(0, 1))
        self.assertEqual(m.tobytes(), expected)