title: Python Telegram bot callback with a custom message not working
body: <p>I am using Python telegram bot api (<a href="https://python-telegram-bot.org/" rel="nofollow noreferrer">https://python-telegram-bot.org/</a>) to reply to commands.</p>
  
  <p>My dispatcher looks like this:</p>
  
  <pre><code>updater.dispatcher.add_handler(CommandHandler('show', hello, tweet))
  </code></pre>
  
  <p>And callback function is:</p>
  
  <pre><code>def hello(bot, update, tweet):
      update.message.reply_text(tweet)
  </code></pre>
  
  <p>But this results in a hang. Any suggestions?</p>