fixed python packages AGAIN

pkgs/default.nix

@@ -3,10 +3,12 @@
   prev,
   lib,
   forFlakeOutputs ? false,
+  forPythonScope ? false,
   ...
 }:
 let
   dirs = path: lib.attrNames (lib.filterAttrs (_: t: t == "directory") (builtins.readDir path));
+  pythonPackagesDir = ./by-category/pythonPackages;
 
   packagesFromTree =
     base: callPackage:
@@ -48,5 +50,38 @@ let
   };
 
   overlayAttrs = byNamePkgs // byCategoryPkgs;
+  directFlakePackages = lib.filterAttrs (_: lib.isDerivation) overlayAttrs;
+
+  flakePythonPackages =
+    let
+      pyPkgs = if pkgs ? python313Packages then pkgs.python313Packages else pkgs.python3Packages;
+      treePkgs =
+        if builtins.pathExists pythonPackagesDir then
+          removeAttrs (packagesFromTree pythonPackagesDir pyPkgs.callPackage) [
+            "python-packages"
+          ]
+        else
+          { };
+      prefabPkgs =
+        if builtins.pathExists (pythonPackagesDir + "/prefab-builder.nix") then
+          prev.lib.customisation.callPackagesWith (
+            pyPkgs
+            // {
+              lib = prev.lib;
+              pkgs = prev;
+              pyPkgs = pyPkgs;
+              fetchFromGitHub = prev.fetchFromGitHub;
+              fetchPypi = prev.fetchPypi;
+            }
+          ) (pythonPackagesDir + "/prefab-builder.nix") { }
+        else
+          { };
+    in
+    treePkgs // prefabPkgs;
 in
-if forFlakeOutputs then lib.filterAttrs (_: lib.isDerivation) overlayAttrs else overlayAttrs
+if forPythonScope then
+  flakePythonPackages
+else if forFlakeOutputs then
+  directFlakePackages
+else
+  overlayAttrs