The slides for Inside PHP and Inside Python are probably best accompanied by the modified source code so you can see where changes were made :)

https://github.com/thomaslee/oscon2012-inside-php https://github.com/thomaslee/oscon2012-inside-python

If I had thought ahead a little, I would've done an initial import before the presentations started so that folks could see a nice little diff... oh well. Next time!