A talk I gave for my research lab about PyDy [1], SymPy [2], and my experience in Google Summer of Code [3].
Demo Notebook available on github: https://github.com/jcrist/talks/tree/master/pydy_talk.
[1] https://github.com/pydy/pydy
[2] https://github.com/sympy/sympy
[3] https://www.google-melange.com/gsoc/homepage/google/gsoc2014