Line bot api

import os
from flask import Flask, request, abort

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

app = Flask(__name__)

line_bot_api = LineBotApi('<monToken>')
handler = WebhookHandler('<monWebhookHandler>')


@app.route("/callback", methods=['POST'])
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'


@handler.add(MessageEvent, message=TextMessage)
def handle_message(event):

    if event.message.text == "Hey":
        line_bot_api.reply_message(
            event.reply_token,
            TextSendMessage(text="Salut")
        )
# Et voici la partie qui coince :
    if event.message.text == "push":
        line_bot_api.push_message(
            "<monIDLine", 
            TextSendMessage(text="Hello World !")
            )
# fin de la partie qui coince

if __name__ == "__main__":
    port = int(os.environ.get('PORT', 5000))
    app.run(host='0.0.0.0', port=port)