title: Python Four Digits Counter
body: <p>How do we use python to generate a four digit counter?</p>
  
  <pre><code>range(0,9999)
  </code></pre>
  
  <p>will have 1 digits, 2 digits and 3 digits. We only want 4 digits.</p>
  
  <p>i.e. 0000 to 9999</p>
  
  <p>Of course, the simplest Pythonic way.</p>