code: def blacklistClient(self, clientName: str,
                          reason: str = None, code: int = None):
          
          msg = "{} blacklisting client {}".format(self, clientName)
          if reason:
              msg += " for reason {}".format(reason)
          logger.display(msg)
          self.clientBlacklister.blacklist(clientName)
docs: Add the client specified by `clientName` to this node's blacklist