LINEのbotに1度に複数の返答をさせたい

Question

前提・実現したいこと

LINEbotに複数のメッセージを返信させること。PythonとFlaskを使用。
公式ドキュメントは次の通り。

messagesにArray of とあるので、array型に入れてみたが、ダメだった。
タプル型でもダメだった
#Send reply message
Sends a reply message in response to an event from a user, group, or room.

To send reply messages, you must have a reply token which is included in a webhook event object.

Webhooks are used to notify you when an event occurs. For events that you can respond to, a reply token is issued for replying to messages.

Because the reply token becomes invalid after a certain period of time, responses should be sent as soon as a message is received. Reply tokens can only be used once.

#HTTP request
POST https://api.line.me/v2/bot/message/reply

#Request headers
Content-Type
application/json

Authorization
Bearer {channel access token}

#Request body
###replyToken
String Required
Reply token received via webhook

###messages
Array of message objects Required
Messages to send
Max: 5

###notificationDisabled
Boolean Optional
true: The user doesn't receive a push notification when the message is sent.
false: The user receives a push notification when the message is sent (unless they have disabled push notifications in LINE and/or their device).
Default: false

#Response
Returns status code 200 and an empty JSON object.

発生している問題・エラーメッセージ

LINEbotからの返答がない

該当のソースコード

rom flask import Flask, request, abort
import os

from linebot import (
    LineBotApi, WebhookHandler
)
from linebot.exceptions import (
    InvalidSignatureError
)
from linebot.models import (
    MessageEvent, TextMessage, TextSendMessage,
)

app = Flask(__name__)

# オリジナルの処理
# line_bot_api = LineBotApi('YOUR_CHANNEL_ACCESS_TOKEN')
# handler = WebhookHandler('YOUR_CHANNEL_SECRET')

#環境変数取得
YOUR_CHANNEL_ACCESS_TOKEN = 'PxQ8K7uaYUpJHNRK5PpnKIfeK5oZIAwJBMlgnKfQaRKax6oPNCHdnGo1jw71Lqan4ar7XAzQ3BWIS6POKWF23ZIhr/WjOkjV0VeozwlDmYI7ixJ3rsQG7Er2UUwKTOK1jgOfRFahTD8sKZoh/ncQagdB04t89/1O/w1cDnyilFU='
YOUR_CHANNEL_SECRET = 'e306c77e21315b35232da87cbefc45ad'

line_bot_api = LineBotApi(YOUR_CHANNEL_ACCESS_TOKEN)
handler = WebhookHandler(YOUR_CHANNEL_SECRET)

@app.route("/callback", methods=['POST'])
# the region of Flask.
def callback():
    # get X-Line-Signature header value
    signature = request.headers['X-Line-Signature']

    # get request body as text
    body = request.get_data(as_text=True)
    app.logger.info("Request body: " + body)

    # handle webhook body
    try:
        handler.handle(body, signature)
    except InvalidSignatureError:
        abort(400)

    return 'OK'

# when a message comes from a user
@handler.add(MessageEvent, message=TextMessage)
def handle_message(event):
    line_bot_api.reply_message(
        event.reply_token,
       TextSendMessage(text=#ここの形が分からない)
    )


if __name__ == "__main__":
    #app.run()
    port = int(os.getenv("PORT"))
    app.run(host="0.0.0.0",port=port)

Answer 1

ほぼ一年前の質問ですのですでに解決されているかもしれませんが...

複数のメッセージを返す場合にはTextSendMessageのtext引数に文字列のリストを渡すのではなく
TextSendMessageのtext引数には文字列を渡し
line_bot_api.reply_messageの引数にTextSendMessageのリストを渡すことで実装できると思います。
以下のような形で値を渡すように変更してみてください。

#NG
line_bot_api.reply_message(
    event.reply_token,
    TextSendMessage(text=['メッセージ1', 'メッセージ2'])
)

#OK
line_bot_api.reply_message(
    event.reply_token,
    [TextSendMessage(text='メッセージ1'), TextSendMessage(text='メッセージ2')]
)