def send_group(self, group_name, data):
        path = "api/groups/{0}/send".format(group_name)
        return Group.from_dict(self._post(path, {'value': data}))
Update all feeds in a group with one call.  Group_name should be the
dataset/ETHPy150Open adafruit/io-client-python/Adafruit_IO/client.py/Client.send_group