[pip] Add old flake

python/pip/flake.nix

@@ -0,0 +1,25 @@
+{
+  description = "Python flake for use with pip environments.";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils}:
+  flake-utils.lib.eachDefaultSystem (system:
+  let
+    pkgs = import nixpkgs {
+      inherit system;
+      config.allowUnfree = true;
+    };
+  in {
+    devShells.default = pkgs.mkShell {
+      packages = with pkgs; [
+        python39
+        python39Packages.pip
+
+        # You might want to add an IDE of your choice;
+        # jetbrains.pycharm-professional
+      ];
+    };
+  });
+}