code: def who_am_i():
      
      me = url['me'].format(token)
      r = requests.get(me, params={'client_id': CLIENT_ID})
      r.raise_for_status()
      current_user = r.json()
      logger.debug(me)
  
      logger.info('Hello {0}!'.format(current_user['username']))
      return current_user
docs: Display username from current token and check for validity