Here are instructions for using an iframe with wordpress.org websites.
1. Download the iframe Plugin from here.
2. Use a shortcode in a post like this:
Note: I added a space after the left bracket [ and before the right bracket ] in order to not trigger the shortcode in the below code example.
[ iframe src="https://bluegalaxy.info/cgi-bin/this_script.py" width="100%" height="200" frameborder="1" scrolling="no" ]
Using iframes in a WordPress post or page is really this simple and is a great way to add outside content or even Python CGI output, as seen in the Table of Contents page of this website.