title: Python: Better way to take every letter/number/etc. from a string and convert it into a list?
body: <p>I actually know how to do this using <code>loop</code>, but the code looks too ugly :-(. So I would like to ask some better methods. </p>
  
  <p>E.g. I have a string:</p>
  
  <pre><code>a = "123 456 7sr"
  </code></pre>
  
  <p>I want to convert every number/letter/empty space/etc into a list. The desired result should be like: </p>
  
  <pre><code>["1", "2", "3", " ", "4", "5", "6", " ", "7", "s", "r"]
  </code></pre>
  
  <p>Is there some other methods? (Please not the methods using the <code>for/while loop</code>)</p>
  
  <p>Thanks for the help!</p>