Andrew has written an introductory notebook on using and defining functions within python. He has a nice little van't Hoff example at the end as well looking at the effect of temperature on the equilibrium constant. You can check it out here.
I'm sorry if you've been having problems with downloading the notebooks, we had a fancy piece of code which automated the process, but this didn't seem to work for Chrome users, we've changed it to a manual download (save as) there are instructions on most pages - but if you need to ask please do.
Happy coding.
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