%% Copyright 2021-2024 Tobias Enderle
%%
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\documentclass{article}

\usepackage{pyluatex}

\title{PyLuaTeX Example -- Sessions}
\author{Tobias Enderle}

\pysession{session-a}
\pyc{greeting = "Hi, I'm session A"}
\pyc{var = 'Only available in session A'}

\pysession{session-b}
\pyc{greeting = "Hi, I'm session B"}

\begin{document}

\maketitle

In this document the use of sessions is demonstrated.
Sessions provide a way to structure and separate code.
Variables, function definitions, etc. of one session are only accessible
by that very session.
This can be helpful if you have long documents with a lot of code.

\paragraph{Session A}
\pysession{session-a}
The content of the variable \texttt{greeting} in session A is:\\
\py{greeting}

\paragraph{Session B}
\pysession{session-b}
The content of the variable \texttt{greeting} in session B is:\\
\py{greeting}

The variable \texttt{var} is only defined in session A, therefore
an error is printed here:
\begin{python}
try:
    print(var)
except NameError as e:
    print(e)
\end{python}

\end{document}