>>> s = '\xe7\xb3\xbb\xe7\xbb\x9f\xe7\xb9\x81\xe5\xbf\x99'
>>> ss = s.encode('raw_unicode_escape')
>>> print(type(ss))
<class 'bytes'>
>>> print(ss)
b'\xe7\xb3\xbb\xe7\xbb\x9f\xe7\xb9\x81\xe5\xbf\x99'
>>> sss = ss.decode()
>>> print(sss)
系统繁忙