def get_currencys(self, site='Pro', _async=False):
        """
        获取所有币种
        :param site:
        :return:
        """
        assert site in ['Pro', 'HADAX']
        params = {}
        path = f'/v1{"/" if site == "Pro" else "/hadax/"}common/currencys'
        return api_key_get(params, path, _async=_async)
获取所有币种
        :param site:
        :return: