def _add_keyword_low(self, kwpath, value, params):
        """Adds keyword"""
        if len(kwpath) == 1:
            params[kwpath[0]] = value
        elif kwpath[0] not in params.keys():
            new_subsection = {}
            params[kwpath[0]] = new_subsection
            self._add_keyword_low(kwpath[1:], value, new_subsection)
        else:
            self._add_keyword_low(kwpath[1:], value, params[kwpath[0]])
Adds keyword