title: How to create a grouped bar chart in Altair?
body: <p>How does one create a grouped bar chart in Altair? I'm trying the following but it is just producing two graphs side by side.</p>
  
  <pre><code>Chart(data).mark_bar().encode(
     column='Gender',
     x='Genre',
     y='Rating',
     color='Gender'
  )
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/SFLRb.png" rel="noreferrer"><img src="https://i.stack.imgur.com/SFLRb.png" alt="This is the image produce"></a></p>