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I have been working with this in order to generate an RSS feed using web2py.
I found, XMLGenerator method does not validate if is an unicode or string type, and it does not encode accord the encoding parameter of the XMLGenerator.
I added changed the method to verify if is an unicode object or try to convert to it using the desired encoding.
Recall that the _write UnbufferedTextIOWrapper receives an unicode object as parameter.
 def characters(self, content):
 if isinstance(content, unicode): 
 self._write(escape(content))
	else:
	 self._write(escape(unicode(content,self._encoding)))