title: how to change value of type in nested dictionary
body: <p>I have the following dictionary: <code>d = {s: {0:{'n','s'}, 1:{'s'} }}</code></p>
  
  <p>How can I change the value of <code>{'n','s'}(set)</code> to <code>['n','s']</code> as short as possible.</p>
  
  <p>Because I have to print it's value in the form <code>0:['n','s'], 1:['s']</code></p>