title: How to remove the last comma?
body: <p>So I am wondering what the best way to knock off that last comma printed.</p>
  
  <pre><code>for i in range(1, 21):
      print(i, end=",")
  </code></pre>
  
  <p>The output should be:</p>
  
  <pre><code>1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20
  </code></pre>