new_contents: #!/usr/bin/env python3
  # A simple script to print all updates received
  
  from telethon import TelegramClient
  from getpass import getpass
  from os import environ
  # environ is used to get API information from environment variables
  # You could also use a config file, pass them as arguments, 
  # or even hardcode them (not recommended)
  
  def main():
      session_name = environ.get('TG_SESSION','session')
      user_phone = environ['TG_PHONE'],
      client = TelegramClient(session_name,
              int(environ['TG_API_ID']), 
                  environ['TG_API_HASH'],
                  proxy=None,
                  update_workers=4)
  
      print('INFO: Connecting to Telegram Servers...', end='', flush=True)
      client.connect()
      print('Done!')
  
      if not client.is_user_authorized():
          print('INFO: Unauthorized user')
          client.send_code_request(user_phone)
          code_ok = False
          while not code_ok:
              code = input('Enter the auth code: ')
              try:
                  code_ok = client.sign_in(user_phone, code)
              except SessionPasswordNeededError:
                  pw = getpass('Two step verification enabled. Please enter your password: ')
                  code_ok = client.sign_in(password=pw)
      print('INFO: Client initialized succesfully!')
  
      client.add_update_handler(update_handler)
      input('Press Enter to stop this!\n')
  
  def update_handler(update):
      print(update) 
      print('Press Enter to stop this!')
  
  if __name__ == '__main__':
      main()
  
subject: Add example script to print out all updates