title: How can I prepend http to a url if it doesn't begin with http?
body: <p>I have urls formatted as:</p>
  
  <pre><code>google.com
  www.google.com
  http://google.com
  http://www.google.com
  </code></pre>
  
  <p>I would like to convert all type of links to a uniform format, starting with <code>http://</code></p>
  
  <pre><code>http://google.com
  </code></pre>
  
  <p>How can I prepend URLs with <code>http://</code> using Python?</p>