test_struct.py 文件源码

def test_length_hint(self):
        lh = operator.length_hint
        s = struct.Struct('>IB')
        b = bytes(range(1, 16))
        it = s.iter_unpack(b)
        self.assertEqual(lh(it), 3)
        next(it)
        self.assertEqual(lh(it), 2)
        next(it)
        self.assertEqual(lh(it), 1)
        next(it)
        self.assertEqual(lh(it), 0)
        self.assertRaises(StopIteration, next, it)
        self.assertEqual(lh(it), 0)