(self, spaces, lines)
Parse lines and extract the list of key elements.

        :param spaces: leading spaces of starting line
        :type spaces: str
        :param lines: list of strings
        :type lines: list(str)
        :return: list of key elements
Parse lines and extract the list of key elements.
Parse lines and extract the list of key elements .
def _get_list_key(self, spaces, lines):
        """ Parse lines and extract the list of key elements.

        :param spaces: leading spaces of starting line
        :type spaces: str
        :param lines: list of strings
        :type lines: list(str)
        :return: list of key elements
        """
        raise NotImplementedError
def _get_list_key ( self , spaces , lines ) : raise NotImplementedError