An example function to unescape the xml unicode (unsafe)

unescape.py

import xml.parsers.expat
from io import StringIO

def unescape(s:str) -> str:
    # the rest of this assumes that `s` is UTF-8
    output = StringIO()
    
    # create and initialize a parser object
    p = xml.parsers.expat.ParserCreate("utf-8")
    p.buffer_text = True
    p.CharacterDataHandler = output.write

    # parse the data wrapped in a dummy element
    # (needed so the "document" is well-formed)
    p.Parse("<e>", 0)
    p.Parse(s, 0)
    p.Parse("</e>", 1)
    
    return output.getvalue()


assert unescape("&#x5468;&#x6770;&#x502b;") == "周杰倫", "Fail to parse xml unicode"