def lxml(self):
        if ('html' not in self.mimetype and 'xml' not in self.mimetype):
            raise AttributeError('Not an HTML/XML response')
        from lxml import etree
        try:
            from lxml.html import fromstring
        except ImportError:
            fromstring = etree.HTML
        if self.mimetype=='text/html':
            return fromstring(self.data)
        return etree.XML(self.data)
Get an lxml etree if possible.
dataset/ETHPy150Open GeekTrainer/Flask/Work/Trivia - Module 5/env/Lib/site-packages/werkzeug/contrib/testtools.py/ContentAccessors.lxml