unescaping xml escape codes

[Daniel]

I'm working with strings that contain xml escape codes, such as '0'
and need a way in python to unescape these back to their ascii
representation, such as '&' but can't seem to find a python method for
this. I tried xml.sax.saxutils.unescape(s), but while it works with
'&', it doesn't work with '0' and other numeric codes. Any
suggestions on how to decode the numeric xml escape codes such as this?
Thanks.

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