\newcommand{\refmodule}[2]{\index{#1@{\idxcode{#1}} (#2module)}}
\newcommand{\refmodindex}[1]{\refmodule{#1}{}}
\newcommand{\refbimodindex}[1]{\refmodule{#1}{built-in }}
+\newcommand{\refexmodindex}[1]{\refmodule{#1}{extension }}
\newcommand{\refstmodindex}[1]{\refmodule{#1}{standard }}
% support for the module index
% Python & extension modules outside the main distribution
\newcommand{\modindex}[1]{\defmodindex{#1}{}}
-\newcommand{\exmodindex}[1]{\defmodindex{#1}{}}
+\newcommand{\exmodindex}[1]{\defmodindex{#1}{extension }}
% Additional string for an index entry
\newcommand{\index@subitem}{}