diff -r adb85e126341 -r 19754ed6050f day2/session4.tex
--- a/day2/session4.tex	Sun Jan 10 16:43:15 2010 +0530
+++ b/day2/session4.tex	Sun Jan 10 16:57:51 2010 +0530
@@ -429,6 +429,28 @@
 
 \end{document}
 
+%% \begin{frame}[fragile]
+%%     \frametitle{\incqno}
+%%     Consider a module called \lstinline+gcd.py+ looking like this:
+%%     \begin{lstlisting}
+%% def gcd(a, b):
+%%    ...
+
+%% if __name__ == '__main__':
+%%     print gcd(10, 25)
+%%     \end{lstlisting}
+%% If this module is imported, will it print the gcd of 10 and 25?
+%% \end{frame}
+
+%% \begin{frame}[fragile]
+%%     \frametitle{\incqno}
+%%   \begin{lstlisting}
+%% In [1]: print hello 
+%%   \end{lstlisting}
+%%   Exactly what exception will you get if you run this on a fresh
+%%   interpreter?
+%% \end{frame}
+
 %% \begin{frame}
 %%     \frametitle{Testing}