code: def read(self):
          
          try:
              f = urllib.request.urlopen(self.url)
          except urllib.error.HTTPError as err:
              if err.code in (401, 403):
                  self.disallow_all = True
              elif err.code >= 400:
                  self.allow_all = True
          else:
              raw = f.read()
              self.parse(raw.decode("utf-8").splitlines())
docs: Reads the robots.txt URL and feeds it to the parser.