def synthese(self, month=None):
        """
        month format: YYYYMM
        """
        if month is None and self.legislature == '2012-2017':
            raise AssertionError('Global Synthesis on legislature does not work, see https://github.com/regardscitoyens/nosdeputes.fr/issues/69')

        if month is None:
            month = 'data'

        url = '%s/synthese/%s/%s' % (self.base_url, month, self.format)

        data = requests.get(url).json()
        return [depute[self.ptype] for depute in data[self.ptype_plural]]
month format: YYYYMM