test_byteswap.py 文件源码

def test_endian_double(self):
        if sys.byteorder == "little":
            self.assertIs(c_double.__ctype_le__, c_double)
            self.assertIs(c_double.__ctype_be__.__ctype_le__, c_double)
        else:
            self.assertIs(c_double.__ctype_be__, c_double)
            self.assertIs(c_double.__ctype_le__.__ctype_be__, c_double)
        s = c_double(math.pi)
        self.assertEqual(s.value, math.pi)
        self.assertEqual(bin(struct.pack("d", math.pi)), bin(s))
        s = c_double.__ctype_le__(math.pi)
        self.assertEqual(s.value, math.pi)
        self.assertEqual(bin(struct.pack("<d", math.pi)), bin(s))
        s = c_double.__ctype_be__(math.pi)
        self.assertEqual(s.value, math.pi)
        self.assertEqual(bin(struct.pack(">d", math.pi)), bin(s))