'\0'等于'\x00'，可'\9'为什么不等于'\x09'呢？

>>> '\0'
'\x00'
>>> '\7'
'\x07'
>>> '\9'
'\\9'
>>> '\255'
'\xad'
>>>

为什么会这样？'\255'为什么成了'\xad'？
在网上找了很多教程也没有明确提到这么细节的问题，还望各位大哥大姐解疑！

¹À¼ÆÊÇ\ºóÃæµÄÊý×ÖÊǰ˽øÖÆ. ËùÒÔ³¬7µÄ»°¾Í²»´¦Àí.

ÔÚ07-3-12£¬DDGG <pschen在21cn.com> дµÀ£º
>
> '\0'µÈÓÚ'\x00'£¬¿É'\9'Ϊʲô²»µÈÓÚ'\x09'ÄØ£¿
>
> >>> '\0'
> '\x00'
> >>> '\7'
> '\x07'
> >>> '\9'
> '\\9'
> >>> '\255'
> '\xad'
> >>>
>
> Ϊʲô»áÕâÑù£¿'\255'Ϊʲô³ÉÁË'\xad'£¿
> ÔÚÍøÉÏÕÒÁ˺ܶà½Ì³ÌҲûÓÐÃ÷È·Ìáµ½Õâôϸ½ÚµÄÎÊÌ⣬»¹Íû¸÷λ´ó¸ç´ó½ã½âÒÉ£¡
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