def query_string(self) -> str:
        """The query string.  If you set this to a string
        :attr:`args` will no longer be available.
        """
        if self._query_string is None:
            if self._args is not None:
                return _urlencode(self._args)
            return ""
        return self._query_string
The query string.  If you set this to a string
        :attr:`args` will no longer be available.
        
src/werkzeug/test.py