test_marshal.py 文件源码

def test_int64(self):
        # Simulate int marshaling on a 64-bit box.  This is most interesting if
        # we're running the test on a 32-bit box, of course.

        def to_little_endian_string(value, nbytes):
            b = bytearray()
            for i in range(nbytes):
                b.append(value & 0xff)
                value >>= 8
            return b

        maxint64 = (1 << 63) - 1
        minint64 = -maxint64-1

        for base in maxint64, minint64, -maxint64, -(minint64 >> 1):
            while base:
                s = b'I' + to_little_endian_string(base, 8)
                got = marshal.loads(s)
                self.assertEqual(base, got)
                if base == -1:  # a fixed-point for shifting right 1
                    base = 0
                else:
                    base >>= 1