import telegram.ext

with open('token.txt', 'r') as f:
  TOKEN = f.read()

def start(update, context):
  update.message.reply_text('Hi')

def help(update, context):
  update.message.reply_text('i am a chat bot just begin to chat with me')

def handle_message(update, context):
  update.message.reply_text(f'I got {update.message.text}')
  print(update.message.text, update.message.chat.username)

updater = telegram.ext.Updater(TOKEN, use_context=True)
disp = updater.dispatcher

disp.add_handler(telegram.ext.CommandHandler('start', start))
disp.add_handler(telegram.ext.CommandHandler('help', help))
disp.add_handler(telegram.ext.MessageHandler(telegram.ext.Filters.text, handle_message))

updater.start_polling()
updater.idle()