code: def get(self, url_type):
          
          lowtype = url_type.lower()
          if lowtype == "public":
              return self.public_url
          elif lowtype == "private":
              return self.private_url
          else:
              raise ValueError("Valid values are 'public' or 'private'; "
                      "received '%s'." % url_type)
docs: Accepts either 'public' or 'private' as a parameter, and returns the
          corresponding value for 'public_url' or 'private_url', respectively.