title: Glob files for a range of numbers
body: <p>I have a directory of files with names 10.txt, 11.txt .. 29.txt, 30.txt</p>
  
  <p>How can I select files 12 to 21?</p>
  
  <p>Ive tried:</p>
  
  <pre><code>glob.glob('path/[12-21].txt')
  </code></pre>