flake.nix: overlay package into pythonPackages

default.nix

@@ -1,18 +1,25 @@
 { lib
-, python3Packages
+, buildPythonPackage
+
+, setuptools
+, setuptools-scm
+
+, sqlalchemy
 }:
-python3Packages.buildPythonApplication {
+
+buildPythonPackage {
   pname = "libdib";
   version = "unstable";
   src = lib.cleanSource ./.;
 
   format = "pyproject";
 
-  nativeBuildInputs = with python3Packages; [
+  nativeBuildInputs = [
     setuptools
     setuptools-scm
   ];
-  propagatedBuildInputs = with python3Packages; [
+
+  propagatedBuildInputs = [
     sqlalchemy
   ];
 }