Hi, Kevin here from Comparitech. Just wanted to let you know about a broken link I found here - http://preview.cgl.ucsf.edu/chimera/data/downloads/1.1700/docs/ProgrammersGu... The Python tutorial link (http://www.python.org/doc/current/tut/tut.html) isn’t working, if you are still updating your page, the new tutorial link is here https://docs.python.org/3/tutorial/ Perhaps you’d also consider adding a link to the Python cheat sheet my colleague Tim just finished - https://comparite.ch/python-cs Hope this helps. Thanks! Kevin PS. If you’re not interested just let me know and you won’t hear from me again. Kevin Manning Comparitech - tech compared and reviewed Comparitech is owned and operated by Comparitech Limited, company no. 09962280, Kings Lodge, London Road, West Kingsdown, Sevenoaks, Kent, TN15 6AR United Kingdom. Telephone +44(0)333 577 0163