title: How to store user data and display them according to their corresponding callbacks
body: <p><strong>Here's my code:</strong></p>
  <pre><code>from telegram import *
  from telegram.ext import *
  import telegram, telegram.ext
  
  u = Updater('TOKEN', use_context=True)
  j=u.job_queue
  
  def set(update: Update, context: CallbackContext):
      user_says=' '.join(context.args)
      user_says=user_says.split(' ')
      global item, chat_id
      item=user_says[1:]
      chat_id=update.effective_chat.id
      j.run_once(callback, int(user_says[0]))
  
  def callback(context: telegram.ext.CallbackContext):
      context.bot.send_message(chat_id=chat_id, text=f'Great you won {item}')
  
  if __name__ == '__main__':
      dp = u.dispatcher
      dp.add_handler(CommandHandler('set', set))
      u.start_polling()
      u.idle()
  </code></pre>
  <p>So the problem is if someone start the timer and in the mean time when the timer is running someone else (or the same person) start different timer the value of item get replaced with the newest one, it will display wrong item value for all the timers which are already running in that time (except for the latest one) how can I store items and show them with their corresponding timer's callback</p>
  <p><em>Hope you understood my question :)</em></p>