test_sys.py 文件源码

def test_errors(self):
        class BadSizeof(object):
            def __sizeof__(self):
                raise ValueError
        self.assertRaises(ValueError, sys.getsizeof, BadSizeof())

        class InvalidSizeof(object):
            def __sizeof__(self):
                return None
        self.assertRaises(TypeError, sys.getsizeof, InvalidSizeof())
        sentinel = ["sentinel"]
        self.assertIs(sys.getsizeof(InvalidSizeof(), sentinel), sentinel)

        class OverflowSizeof(long):
            def __sizeof__(self):
                return int(self)
        self.assertEqual(sys.getsizeof(OverflowSizeof(sys.maxsize)),
                         sys.maxsize + self.gc_headsize)
        with self.assertRaises(OverflowError):
            sys.getsizeof(OverflowSizeof(sys.maxsize + 1))
        with self.assertRaises(ValueError):
            sys.getsizeof(OverflowSizeof(-1))
        with self.assertRaises((ValueError, OverflowError)):
            sys.getsizeof(OverflowSizeof(-sys.maxsize - 1))