How to use the tld.get_fld function in tld

def checkuser(web):

    print(GR+' [*] Loading module...')
    time.sleep(0.6)
    #print(R+'\n    =======================')
    #print(R+'     C H E C K   A L I A S')
    #print(R+'    =======================\n')
    from core.methods.print import posintpas
    posintpas("check alias") 

    print(GR+' [*] Parsing Url...')
    web0 = tld.get_fld(web).split('.', 1)[0]
    print(G+' [+] Alias Set : '+web0+C+color.TR2+C)
    print(O+' [*] Setting services...'+C)
    time.sleep(0.7)
    global services
    services = ['YouTube', 'Hypemachine', 'Yahoo', 'Linkagogo', 'Coolspotters', 'Wikipedia', 'Twitter', 'gdgt', 'BlogMarks', 'LinkedIn', 'Ebay', 'Tumblr', 'Pinterest','yotify', 'Blogger', 'Flickr', 'FortyThreeMarks,Moof', 'HuffingtonPost', 'Wordpress', 'DailyMotion', 'LiveJournal', 'vimeo', 'DeviantArt', 'reddit','StumbleUpon', 'Answers', 'Sourceforge', 'Wikia', 'ArmChairGM', 'Photobucket', 'MySpace', 'Etsy,SlideShare', 'Fiverr', 'scribd', 'Squidoo', 'ImageShack','ThemeForest', 'SoundCloud', 'Tagged', 'Hulu', 'Typepad', 'Hubpages', 'weebly', 'Zimbio', 'github', 'TMZ', 'WikiHow', 'Delicious', 'zillow', 'Jimdo', 'goodreads','Segnalo', 'Netlog', 'Issuu', 'ForumNokia', 'UStream', 'Gamespot', 'MetaCafe', 'askfm', 'hi5', 'JustinTV', 'Blekko', 'Skyrock', 'Cracked', 'foursquare', 'LastFM','posterous', 'steam', 'Opera', 'Dreamstime', 'Fixya', 'UltimateGuitar', 'docstoc', 'FanPop', 'Break', 'tinyurl', 'Kongregate', 'Disqus', 'Armorgames', 'Behance','ChaCha', 'CafeMom', 'Liveleak', 'Topix', 'lonelyplanet', 'Stardoll', 'Instructables', 'Polyvore', 'Proboards', 'Weheartit', 'Diigo', 'Gawker', 'FriendFeed','Videobash', 'Technorati', 'Gravatar', 'Dribbble', 'formspringme', 'myfitnesspal', '500px', 'Newgrounds', 'GrindTV', 'smugmug', 'ibibo', 'ReverbNation', 'Netvibes','Slashdot', 'Fool', 'Plurk', 'zedge', 'Discogs', 'YardBarker', 'Ebaumsworld', 'sparkpeople', 'Sharethis', 'Xmarks', 'Crunchbase', 'FunnyOrDie,Suite101', 'OVGuide','Veoh', 'Yuku', 'Experienceproject', 'Fotolog', 'Hotklix', 'Epinions', 'Hyves', 'Sodahead', 'Stylebistro', 'fark', 'AboutMe', 'Metacritic', 'Toluna', 'Mobypicture','Gather', 'Datpiff', 'mouthshut', 'blogtalkradio', 'Dzone', 'APSense', 'Bigstockphoto', 'n4g', 'Newsvine', 'ColourLovers', 'Icanhazcheezburger', 'Xanga','InsaneJournal', 'redbubble', 'Kaboodle', 'Folkd', 'Bebo', 'Getsatisfaction', 'WebShots', 'threadless', 'Active', 'GetGlue', 'Shockwave', 'Pbase']
    print(C+' [!] Loaded '+str(len(services))+' services...')
    check0x00(web0,web)

def domain_sanity_check(domain): #Verify the domain name sanity
    if domain:
        try:
            domain = get_fld(domain, fix_protocol = True)
            return domain
        except:
            print(colored("[!] Incorrect domain format. Please follow this format: example.com, http(s)://example.com, www.example.com", "red"))
            sys.exit(1)
    else:
        pass

sublist.append(a)

    except IOError:
        print(R+' [-] Wordlist not found!')

    global found
    if 'http://' in web:
        web = web.replace('http://','')
    elif 'https://' in web:
        web = web.replace('https://','')
    else:
        pass

    web = 'http://' + web

    tld0 = get_fld(web)

    if len(sublist) > 0:
        for m in sublist:
            furl = str(m) + '.' + str(tld0)
            flist.append(furl)

    if flist:
        time.sleep(0.5)
        print(R+'\n      B R U T E F O R C E R')
        print(R+'     =======================\n')
        print(GR+' [*] Bruteforcing for possible subdomains...')
        for url in flist:
            if 'http://' in url:
                url = url.replace('http://','')
            elif 'https://' in url:
                url = url.replace('https://','')

def get_fld_from_value(value, zone):
    """
    Get the First Level Domain (FLD) for the provided value
    """
    res = get_fld(value, fix_protocol=True, fail_silently=True)
    if res is None:
        return zone

    return res

def posting_to_slack(result, dns_resolve, dns_output): #sending result to slack workplace
    global domain_to_monitor
    global new_subdomains
    if dns_resolve:
        dns_result = dns_output
        if dns_result:
            dns_result = {k:v for k,v in dns_result.items() if v} #filters non-resolving subdomains
            rev_url = []
            print(colored("\n[!] Exporting result to Slack. Please do not interrupt!", "red"))
            for url in dns_result:
                url = url.replace('*.', '')
                url = url.replace('+ ', '')
                rev_url.append(get_fld(url, fix_protocol = True))

            unique_list = list(set(new_subdomains) & set(dns_result.keys())) #filters non-resolving subdomains from new_subdomains list

            for subdomain in unique_list:
                data = "{}:new: {}".format(at_channel(), subdomain)
                slack(data)
                try:
                    if dns_result[subdomain]["A"]:
                        for i in dns_result[subdomain]["A"]:
                            data = "```A : {}```".format(i)
                            slack(data)
                except: pass
                try:
                    if dns_result[subdomain]['CNAME']:
                        for i in dns_result[subdomain]['CNAME']:
                            data = "```CNAME : {}```".format(i)

def host(string):
    if string and '*' not in string:
        return tld.get_fld(string, fix_protocol=True, fail_silently=True)

def get_fld_from_value(value, zone):
    """
    Get the First Level Domain (FLD) for the provided value
    """
    res = get_fld(value, fix_protocol=True, fail_silently=True)
    if res is None:
        return zone

    return res

def lookup(self, domain, wildcard = True):
        try:
            #connecting to crt.sh postgres database to retrieve subdomains.
            unique_domains = set()
            domain = domain.replace('%25.', '')
            conn = psycopg2.connect("dbname={0} user={1} host={2}".format(DB_NAME, DB_USER, DB_HOST))
            conn.autocommit = True
            cursor = conn.cursor()
            cursor.execute("SELECT ci.NAME_VALUE NAME_VALUE FROM certificate_identity ci WHERE ci.NAME_TYPE = 'dNSName' AND reverse(lower(ci.NAME_VALUE)) LIKE reverse(lower('%{}'));".format(domain))
            for result in cursor.fetchall():
                matches = re.findall(r"\'(.+?)\'", str(result))
                for subdomain in matches:
                    try:
                        if get_fld("https://" + subdomain) == domain:
                            unique_domains.add(subdomain.lower())
                    except: pass
            return sorted(unique_domains)
        except:
            base_url = "https://crt.sh/?q={}&output=json"
            if wildcard:
                domain = "%25.{}".format(domain)
                url = base_url.format(domain)
            subdomains = set()
            user_agent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:64.0) Gecko/20100101 Firefox/64.0'
            req = requests.get(url, headers={'User-Agent': user_agent}, timeout=30, verify=False) #times out after 30 seconds waiting (Mainly for large datasets)
            if req.status_code == 200:
                content = req.content.decode('utf-8')
                data = json.loads(content)
                for subdomain in data:
                    subdomains.add(subdomain["name_value"].lower())