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Trying to replicate this PHP Stumbleupon like code into Flask

Hi guys. I'm trying to replicate some code into flask but I just can't imagine how can this be accomplish. It's a Stumbleupon like website but it's only the iFrame loading different websites, it's very simple. I've learn Flask through the courses but I'm trying to replicate a simple PHP code into Flask. If anyone would like to help I will really appreciated.

Here is the simple PHP code:


@$do = $_REQUEST['do'];
$urls = array(

if(isset($do) or !$do){ 
  $max = count($urls);
  $stumble = rand(0,$max); 
  echo "<br /><br /><iframe frameborder='0' noresize='noresize' style='position: absolute; background: transparent; width: 100%; height:100%;' src='$urls[$stumble]' />This Site uses iFrames</iframe>"; 
echo "<div>Hello</div>";


<div align="center"><a href="?do=stumble" />Stumble</a></div><br /><br />