another one

modules/apps/development/languages.nix

@@ -0,0 +1,20 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  options = {
+    apps.development.languages = {
+      python = lib.mkEnableOption "enable python";
+    };
+  };
+
+  config = {
+    environment.systemPackages = with pkgs; [
+      (lib.mkIf lib.mkIf config.development.languages.python.enable virtualenv)
+    ];
+  };
+}