title: What is the easiest way to convert list with str into list with int?
body: <p>What is the easiest way to convert list with <code>str</code> into list with <code>int</code> in Python? 
  For example, we have to convert <code>['1', '2', '3']</code> to <code>[1, 2, 3]</code>. Of course, we can use a <code>for</code> loop, but it's too easy.</p>