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% https://tex.stackexchange.com/q/580636/
\documentclass{article}
\usepackage[use-files]{xsim}
\usepackage[colorlinks,allcolors=blue]{hyperref}
\DeclareExerciseProperty{hints}
\newcounter{hint}
\renewcommand\theHhint{\ExerciseID.\arabic{hint}}
\newcounter{hints}
\newcounter{step}
\NewDocumentEnvironment{hint}{}{%
\stepcounter{hint}%
\XSIMsetfilebegin{%
\par
\refstepcounter{hint}\label{hint:\ExerciseID:\arabic{hint}}%
\noindent\textbf{Hint~\thehint\ to exercise \GetExerciseProperty{counter}}%
\hfill Back to exercise \ref{ex:\ExerciseID}\par
\noindent
}%
\XSIMsetfileend{\par\addvspace{\bigskipamount}}%
\XSIMfilewritestart{\jobname-hint-\ExerciseID-\arabic{hint}.tex}%
}{%
\XSIMfilewritestop
\stepcounter{hints}%
\SetExpandedExerciseProperty{hints}{\arabic{hints}}%
}
\DeclareExerciseEnvironmentTemplate{hints}{%
\setcounter{hint}{0}%
\setcounter{hints}{0}%
\par\noindent
\textbf{\XSIMmixedcase{\GetExerciseName}\GetExerciseProperty{counter}:}\hfill
\IfExercisePropertySetT{hints}{%
\setcounter{step}{0}%
\def\hintcomma{\def\hintcomma{, }}%
Hint\ifnum\GetExerciseProperty{hints}=1\else s\fi:
\loop\unless\ifnum\value{step}=\GetExerciseProperty{hints}
\stepcounter{step}%
\hintcomma\ref{hint:\ExerciseID:\arabic{step}}%
\repeat
\par\noindent
}%
}{\par\addvspace{\bigskipamount}}
\xsimsetup{
exercise/within = section ,
exercise/begin-hook = \label{ex:\ExerciseID} ,
exercise/template = hints
}
\newcommand\printhints{%
\ForEachUsedExerciseByType{%
\setcounter{step}{0}%
\setcounter{hint}{0}%
\loop\unless\ifnum\value{step}=\GetExerciseProperty{hints}
\stepcounter{step}%
\input{\jobname-hint-\ExerciseID-\arabic{step}.tex}%
\repeat
}%
}
\begin{document}
\section{Exercises}
\begin{exercise}
Description of the exercise. Run the following command
\begin{verbatim}
print("Hello world")
Verbatim &^%$&\content
\end{verbatim}
\begin{hint}
Run the example from the command line with the python command.
\end{hint}
\begin{hint}
The solution is 42.
\end{hint}
\end{exercise}
\begin{exercise}
Another exercise
\begin{hint}
The first ten million years were the worst. Some \verb+&$+.
\end{hint}
\end{exercise}
\section{Hints}
\printhints
\end{document}
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