Comment modifier la police des numéros de paragraphe ?#

Pour modifier la police des numéros de paragraphe, il faut redéfinir \@seccntformat. En voici un exemple où la commande est redéfinie en cours de document :

Exemple compilable et éditable
\documentclass[french]{article}
  \usepackage[T1]{fontenc}    % Encodage T1 (adapté au français)
  \usepackage{lmodern}        % Caractères plus lisibles
  \usepackage{babel}          % Réglages linguistiques (avec french)
  \pagestyle{empty}           % N'affiche pas de numéro de page
\begin{document}
\section{En voici, un exemple !}
% Code de modification 
\makeatletter
\renewcommand\@seccntformat[1]%
{\textsf{\@nameuse{the#1}\quad}}
\makeatother
\section{En deux parties, en prime !}
\end{document}
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Compilation... . . .