bot.py

import os
import sys
import time

from slackclient import SlackClient
from telegram.bot import Bot

SLACK_TOKEN = os.environ['SLACK_TOKEN']
sc = SlackClient(SLACK_TOKEN)

TELEGRAM_TOKEN = os.environ['TELEGRAM_TOKEN']
TELEGRAM_TARGET = os.environ['TELEGRAM_TARGET']
telegram_bot = Bot(TELEGRAM_TOKEN)

if sc.rtm_connect():
    while True:
        messages = sc.rtm_read()
        for message in messages:
            try:
                if message['type'] == 'message':
                    if message['channel'][0] == 'G':
                        channel = sc.api_call(
                            "groups.info",
                            channel=message['channel'])['group']
                    elif message['channel'][0] == 'C':
                        channel = sc.api_call(
                            "channels.info",
                            channel=message['channel'])['channel']
                    else:
                        channel = {'name': 'bot'}

                    user = sc.api_call(
                        "users.info",
                        user=message['user'])['user']

                    msg_string = '@{} posted to #{}: {}'.format(user['name'], channel['name'], message['text'])
                    telegram_bot.sendMessage(TELEGRAM_TARGET, msg_string)
            except:
                print('Could not send message.')
                print("Unexpected error:", sys.exc_info()[0])
        time.sleep(1)
else:
    print("Connection Failed, invalid token?")