如果您希望 至- 转义序列的解码，所以输入和输出都是Unicode：
def string_escape(s, encoding='utf-8'):
return (s.encode('latin1') # To bytes, required by 'unicode-escape'
.decode('unicode-escape') # Perform the actual octal-escaping decode
.encode('latin1') # 1:1 mapping back to bytes
.decode(encoding)) # Decode original encoding
测试：
>>> string_escape('\\123omething special')
'Something special'
>>> string_escape(r's\000u\000p\000p\000o\000r\000t\000@'
r'\000p\000s\000i\000l\000o\000c\000.\000c\000o\000m\000',
'utf-16-le')
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