\documentclass{article}

\begin{document}

The year {{year}} can be called the {{year_str}}s.

The name of this package is {{package_name}}.
In caps, that would be {{upper package_name}}.

This is written from {{places.NO}}.

Pi is {{round pi}}.
With one decimal, it is: {{round 1 pi}}.
With two decimals, it is: {{round 2 pi}}.

\end{document}