\documentclass{beamer}

\title[Python]{The Python programming language}
\author[Lubbers]{M. Lubbers}
\date[LUGN43]{\today}
\subject{Python}

\AtBeginSection[]{%
	\begin{frame}
		\frametitle{Table of Contents}
		\tableofcontents[currentsection]
	\end{frame}
}
