title: \xi latex style gives invalid \x escape in python
body: <p>I am plotting in Python using Geany, but when I try to label my axis with say <code>$ \xi$</code> i.e. the greek letter xi, I get the</p>
  
  <blockquote>
    <p>invalid \x escape</p>
  </blockquote>
  
  <p>error. This does not happen for any other greek letter. Any idea how to resolve this?</p>