Nov 2013: I've written a script that uses PhantomJS to create screenshots of Online Python Tutor data structure visualizations as .png files. These files can be included in a textbook or online tutorial.

To run this script, first install PhantomJS and then run:

phantomjs render-opt-screenshots.js test.py

Doing so will pass test.py to Online Python Tutor (which requires online connectivity) and render the state at each step i as a file named test.py.step.<i>.png.

This example run generates 23 files, since there are 23 total execution steps. Here are some example files.

Step 11 (sample-screenshots/test.py.step.11.png):

Step 12 (sample-screenshots/test.py.step.12.png)

Step 13 (sample-screenshots/test.py.step.13.png)