.

flake.nix

@@ -1,8 +1,8 @@
 {
-  description = "Python development environment with Jupyter";
+  description = "Python development env with venv + Jupyter";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05"; # используйте актуальную версию
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
@@ -13,17 +13,28 @@
       in
       {
         devShells.default = pkgs.mkShell {
-          buildInputs = [
-            pkgs.python310
-            pkgs.python310Packages.ipython
-            pkgs.python310Packages.jupyterlab
-            pkgs.git
+          packages = with pkgs; [
+            python312
+            python312Packages.virtualenv
+            python312Packages.pip
+
+            python312Packages.jupyterlab
+            python312Packages.ipykernel
           ];
 
           shellHook = ''
-            echo "Welcome to your Python + Jupyter dev environment!"
+            echo "🐍 Python: $(python3 --version)"
+
+            if [ ! -d .venv ]; then
+              python3 -m venv .venv
+              . .venv/bin/activate
+              pip install --upgrade pip wheel
+            else
+              . .venv/bin/activate
+            fi
+
+            python -m ipykernel install --user --name "nix-env" --display-name "Python (nix)"
           '';
         };
-      }
-    );
+      });
 }