Cloudflare: get the NS records of a given domain via the Google DNS API

CloudflareDNS.py

import requests
import validators
from validators import ValidationFailure

class CloudflareDNS:
    def __init__(self, host):
        self.host = host
        self.record = 'NS'
        self.api_url = 'https://dns.google/resolve?'
        
    def resolve(self):
        valid_domain = validators.domain(self.host.strip()) 
        if isinstance(valid_domain, ValidationFailure):
            return False 
        url = self.api_url + 'name=' + self.host + '&type=' + self.record
        r = requests.get(url, allow_redirects=True)
        return r.json()