python3 进制型字符串转换问题

Question

有一个字符串：

s = '\\111\\116\\x5f\\111\\x41'

如何转成

s = '\111\116\x5f\111\x41'

Answer 1

def str_to_bytes(s):
    import re
    tmp = re.split(r'\\([0-9]{3})|\\x([0-9a-fA-F]{2})', s)
    tmp.pop(0)
    buff = []
    while len(tmp) > 1:
        a = tmp.pop(0)
        b = tmp.pop(0)
        if a is None:
            buff.append(int(b, 16))
        else:
            buff.append(int(a, 8))
        tmp.pop(0)
    return bytes(buff)
    
s = '\\111\\116\\x5f\\111\\x41'
print(str_to_bytes(s))

输出：
IN_IA