So while we're at it, here's a shameless plug for my own spatial network analysis tool with a python API. It produces weighted network stats (accessibility, flows, severance, efficiency) which typically feed into spatial data analysis.
http://www.cf.ac.uk/sdna/sdna-for-python-enthusiasts/
https://www.youtube.com/watch?v=tM41Dxlk_zs
Presentation slides: https://2015.foss4g-na.org/sites/default/files/slides/Instal...
Workshop materials: https://drive.google.com/file/d/0BxNqMqesSSmSSkVmT0d4dDJ4b2c...