diff --git a/sessions/build.sh b/sessions/build.sh
index 67cc2db..eb514c1 100755
--- a/sessions/build.sh
+++ b/sessions/build.sh
@@ -8,6 +8,7 @@ if [[ -z $1 ]]; then
 fi
 
 (
-   cd build
-   texi2pdf ../python-${1}.tex
+  mkdir -p build
+  cd build
+  texi2pdf ../python-${1}.tex
 )
diff --git a/sessions/python-02.tex b/sessions/python-02.tex
index 454d1ab..c584007 100644
--- a/sessions/python-02.tex
+++ b/sessions/python-02.tex
@@ -16,6 +16,8 @@
 
 \begin{document}
 
+\frame{\titlepage}
+
 \begin{frame}
 
 Note: \\~\\
@@ -72,11 +74,6 @@ Sur deux lignes
   'Je suis une longue string'
 \end{lstlisting}
 
-\begin{alertblock}{Note}
-  A double tranchant ...
-\end{alertblock}
-
-
 \end{frame}