\chapter{Making combox Python 3 compatible}\label{a-python3c}

\epigraph{Indeed, when you see new 3.x versions rolling off the line
  and no one using them, it’s hard to shake the feeling that Python
  might die in this transition. How will we ever make it across the
  chasm?}{\textit{Aaron Swartz, March 2012}}

What follows is the changes that will have to be made to make combox
compatible with Python version 3.x, it was generated by the
\verb+2to3+ program.

\lstinputlisting[basicstyle=\scriptsize]{code/combox-2to3.diff}