code: def request(self, cmds):
          
          if isinstance(cmds, list):
              cmd = '\n'.join(cmds)
          elif isinstance(cmds, str) or isinstance(cmds, unicode):
              cmd = cmds
  
          node = etree.Element(qualify('CLI', BASE_NS_1_0))
  
          etree.SubElement(node, qualify('Execution',
                                         BASE_NS_1_0)).text = cmd
  
          return self._request(node)
docs: Single Execution element is permitted.
          cmds can be a list or single command