title: Python how to join cross platform paths
body: <p>If I have a json directory structure that lists paths in mac format ()i.e. 
  <code>"/0000_test/video.mp4"</code> and I want to join it with <code>c:\\</code> the mac format, is there a way to do this?</p>
  
  <p>So on windows the path would be returned as <code>c:\\0000_test\video.mp4"</code> </p>
  
  <p>I have tried <code>os.path.join to no avail</code></p>