\documentclass[twoside]{article}

%for l in preamble_lines:
${l}
%endfor

\setlength{\textfloatsep}{5pt plus 2pt minus 3pt}
%%\setlength{\textfloatsep}{2pt}
\setlength{\floatsep}{0pt}

\begin{document}

${body|n}

\end{document}