code: def dir_names(self, connId='default'):
          
          files_list = []
          thisConn = self.__getConnection(connId)
          try:
              files_list = thisConn.nlst()
          except:
              files_list = []
          return files_list
docs: Returns list of files (and/or directories) of current directory.
          Parameters:
          - connId(optional) - connection identifier. By default equals 'default'