How to use the webtech.utils.Format function in webtech

if options.get('urls_file'):
            try:
                with open(options.get('urls_file')) as f:
                    self.urls = [line.rstrip() for line in f]
            except FileNotFoundException as e:
                print(e)
                exit(-1)

        if options.get('user_agent'):
            self.USER_AGENT = options.get('user_agent')
        elif options.get('random_user_agent'):
            self.USER_AGENT = get_random_user_agent()

        if options.get('grep'):
            # Greppable output
            self.output_format = Format['grep']
        elif options.get('json'):
            # JSON output
            self.output_format = Format['json']

        try:
            self.timeout = int(options.get('timeout', '10'))
        except ValueError:
            self.timeout = 10

def start(self):
        """
        Start the engine, fetch an URL and report the findings
        """
        self.output = {}
        for url in self.urls or []:
            try:
                temp_output = self.start_from_url(url)
            except (FileNotFoundException, ValueError) as e:
                print(e)
                continue
            except ConnectionException as e:
                print("Connection error while scanning {}".format(url))
                continue

            if self.output_format == Format['text']:
                print(temp_output)
            else:
                self.output[url] = temp_output

        if self.output_format == Format['json']:
            print(json.dumps(self.output))
        else:
            for o in self.output.values():
                print(o)

def generate_report(self, output_format):
        """
        Generate a report
        """
        if output_format == Format['grep']:
            techs = ""
            for tech in self.report['tech']:
                if len(techs): techs += "//"
                techs += "{}/{}".format(tech.name, 'unknown' if tech.version is None else tech.version)

            headers = ""
            for header in self.report['headers']:
                if len(headers): headers += "//"
                headers += "{}:{}".format(header["name"], header["value"])

            return "Url>{}\tTechs>{}\tHeaders>{}".format(self.data['url'], techs, headers)
        elif output_format == Format['json']:
            return json.loads(json.dumps(self.report, cls=encoder.Encoder))
        else:
            retval = ""
            retval += "Target URL: {}\n".format(self.data['url'])

"""
        Generate a report
        """
        if output_format == Format['grep']:
            techs = ""
            for tech in self.report['tech']:
                if len(techs): techs += "//"
                techs += "{}/{}".format(tech.name, 'unknown' if tech.version is None else tech.version)

            headers = ""
            for header in self.report['headers']:
                if len(headers): headers += "//"
                headers += "{}:{}".format(header["name"], header["value"])

            return "Url>{}\tTechs>{}\tHeaders>{}".format(self.data['url'], techs, headers)
        elif output_format == Format['json']:
            return json.loads(json.dumps(self.report, cls=encoder.Encoder))
        else:
            retval = ""
            retval += "Target URL: {}\n".format(self.data['url'])
            if self.report['tech']:
                retval += "Detected technologies:\n"
                for tech in self.report['tech']:
                    retval += "\t- {} {}\n".format(tech.name, '' if tech.version is None else tech.version)
            if self.report['headers']:
                retval += "Detected the following interesting custom headers:\n"
                for header in self.report['headers']:
                    retval += "\t- {}: {}\n".format(header["name"], header["value"])
            return retval