code: def get_ns_command(self, cmd_name):
          
          namespace, command = _split_ns_command(cmd_name)
          if not namespace:
              # Name space not given, look for the command
              spaces = self.__find_command_ns(command)
              if not spaces:
                  # Unknown command
                  raise ValueError("Unknown command {0}".format(command))
              elif len(spaces) > 1:
                  # Multiple possibilities
                  if spaces[0] == DEFAULT_NAMESPACE:
                      # Default name space has priority
                      namespace = DEFAULT_NAMESPACE
  
                  else:
                      # Ambiguous name
                      raise ValueError(
                          "Multiple name spaces for command '{0}': {1}".format(
                              command, ", ".join(sorted(spaces))
                          )
                      )
              else:
                  # Use the found name space
                  namespace = spaces[0]
  
          # Command found
          return namespace, command
docs: Retrieves the name space and the command associated to the given
          command name.
  
          :param cmd_name: The given command name
          :return: A 2-tuple (name space, command)
          :raise ValueError: Unknown command name