246   \pause

   246   \pause

   247   \begin{block}{Note:}

   247   \begin{block}{Note:}

   248     This Python idiom works for all types of variables.\\

   248     This Python idiom works for all types of variables.\\

   249 They need not be of the same type!

   249 They need not be of the same type!

   250   \end{block}

   250   \end{block}

   252 \end{frame}

   252 \end{frame}

   253 

   253 

   254 \section{Control flow}

   254 \section{Control flow}

   255 \begin{frame}

   255 \begin{frame}

   256   \frametitle{Control flow constructs}  

   256   \frametitle{Control flow constructs}