testtools.py 文件源码

def xml(self):
        """Get an etree if possible."""
        if 'xml' not in self.mimetype:
            raise AttributeError(
                'Not a XML response (Content-Type: %s)'
                % self.mimetype)
        for module in ['xml.etree.ElementTree', 'ElementTree',
                       'elementtree.ElementTree']:
            etree = import_string(module, silent=True)
            if etree is not None:
                return etree.XML(self.body)
        raise RuntimeError('You must have ElementTree installed '
                           'to use TestResponse.xml')