title: How to export numbers from python then reuse them
body: <p>I've got a function that integrates a pair of differential equations. Right now my code outputs a list for $c$ and a list for $\tau$. I'm plotting these the normal way. Now I want to do long calculations over a large time but the code takes a while so I would like to export some data that can later be called upon to plot figures quicker. How would I do this?
  I have done a lot of research into pandas, and np.save but I don't fully understand what's going on. </p>