gistfile1.txt

    def parseWolframAlphaResponse(self, response, redirected = False, results = None):
        results = results if results is not None else []
        xmlTree = fromstring(response)
        recalculate = xmlTree.get('recalculate')
        success = xmlTree.get('success')
        if success == 'true':
            for pod in xmlTree.findall('pod'):
                title = pod.get('title')
                plaintext = pod.find('subpod/plaintext')
                if plaintext is not None and plaintext.text:
                    results.append((title, plaintext.text.split('\n')))
                    
        if recalculate:
            if not redirected:
                return self.getPage(recalculate).addCallback(self.parseWolframAlphaResponse, True, results)
            elif results:
                return True, results
            else:
                return error, 'Too many redirects.'
        elif success == 'true':
            return True, results
        else:
            return False, [tip.get('text') for tip in xmlTree.findall('tips/tip')]