Switched to monospace font for listings.

beamerthemelumc.sty

@@ -101,7 +101,7 @@
 % Make a nice layout for code.
 \lstset{
   language=Python,
-  basicstyle=\footnotesize,
+  basicstyle=\bf\footnotesize\ttfamily,
   lineskip=-0.40ex,
   frame=shadowbox,
   rulesepcolor=\color{black},