title: Sort list of strings ignoring upper/lower case
body: <p>I have a list which contains strings representing animal names. I need to sort the list. If I use <code>sorted(list)</code>, it will give the list output with uppercase strings first and then lowercase. </p>
  
  <p>But I need the below output.</p>
  
  <p>Input:</p>
  
  <pre><code>var = ['ant','bat','cat','Bat','Lion','Goat','Cat','Ant']
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>['ant', 'Ant', 'bat', 'Bat', 'cat', 'Cat', 'Goat', 'Lion']
  </code></pre>