app.py

import os
import json

from urllib.parse import urlencode
from urllib.request import Request, urlopen

from flask import Flask, request

app = Flask(__name__)

@app.route('/', methods=['POST'])
def webhook():
  data = request.get_json()
  textToParse = data['text'].lower()

  # We don't want to reply to ourselves!
  if data['name'] != 'Friendly Neighborhood Bot':
    if any(x in textToParse for x in ['group chat', ' gc']):
      msg = 'Speaking of group chats, check out the group chat list: https://bit.ly/2FuzbPs'
      send_message(msg)

  return "ok", 200

def send_message(msg):
  url  = 'https://api.groupme.com/v3/bots/post'

  data = {
          'bot_id' : os.getenv('GROUPME_BOT_ID'),
          'text'   : msg,
         }
  request = Request(url, urlencode(data).encode())
  json = urlopen(request).read().decode()