code: def cmd(self, command, args, prefix=None):
          
          if prefix is None:
              prefix = u''
          raw_cmd = u'{0} {1} {2}'.format(prefix, command, args).strip()
          self._send(raw_cmd)
docs: Sends a command to the server.
  
          :param command: IRC code to send.
          :type command: unicode
          :param args: arguments to pass with the command.
          :type args: basestring
          :param prefix: optional prefix to prepend to the command.
          :type prefix: str or None