python 3.13

modules/darwin/README.md

@@ -11,6 +11,13 @@
 ├── packages.nix       # List of packages to install for MacOS
 ```
 
+## Python
+
+`python3.13` is available alongside the default Python environment, without
+changing `python` or `python3` or their configured packages. When the default
+Python already is 3.13, its existing command is used instead of an extra launcher.
+Use `python3.13 -m venv .venv` to create a Python 3.13 virtual environment.
+
 ## Dock activation
 
 Dock setup runs only when `olaf` is the active console user. Each `dockutil`

modules/darwin/packages.nix

@@ -211,3 +211,8 @@ with pkgs;
 
   dockutil
 ]
+++ lib.optionals (lib.versions.majorMinor python3.version != "3.13") [
+  (writeShellScriptBin "python3.13" ''
+    exec ${python313}/bin/python3.13 "$@"
+  '')
+]