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diff --git a/3 resources/nix/shell.nix.md b/3 resources/nix/shell.nix.md
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+Can be used to set up per dir environments, e.g using direnv to automatically activate them.
+## Python
+https://nixos.org/manual/nixpkgs/stable/#python
+
+```nix
+{ pkgs ? import <nixpkgs> {}}:
+
+pkgs.mkShell {
+    packages = [ pkgs.virtualenv ];
+}
+```
+
+```nix
+with import <nixpkgs> {};
+let
+	my_toolz = python311.pkgs.buildPythonPackage rec { 
+		pname = "toolz";
+		version = "0.10.0";
+		pyproject = true;
+		src = fetchPypi {
+			inherit pname version;
+			hash = "sha256-CP3V73yWSArRHBLUct4hrNMjWZlvaaUlkpm1QP66RWA=";
+		};
+		nativeBuildInputs = [
+			python311.pkgs.setuptools
+			python311.pkgs.wheel
+		]; # has no tests
+		doCheck = false;
+		meta = {
+			homepage = "https://github.com/pytoolz/toolz/";
+			description = "List processing tools and functional utilities";
+			# [...]
+		};
+	};
+in python311.withPackages (ps: with ps; [ numpy my_toolz ]) ).env
+```
+
+The [[keyword-import]] is required here because imports a nix expression from another source, in this case nixpkgs.
+It is not required at line two, because python310Packages itself is already in the local scope.
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