python3Packages.dataset: disable on older Python releasese

pkgs/development/python-modules/dataset/default.nix

@@ -1,22 +1,28 @@
 { lib
-, buildPythonPackage
-, fetchPypi
-, sqlalchemy
 , alembic
 , banal
+, buildPythonPackage
+, fetchPypi
+, pythonOlder
+, sqlalchemy
 }:
 
 buildPythonPackage rec {
   pname = "dataset";
   version = "1.5.2";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.7";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-TDZ6fAqFxOdI79o07uMAw/zD8HbHXDKQt0mnoFM1yEc=";
+    hash = "sha256-TDZ6fAqFxOdI79o07uMAw/zD8HbHXDKQt0mnoFM1yEc=";
   };
 
   propagatedBuildInputs = [
-    sqlalchemy alembic banal
+    alembic
+    banal
+    sqlalchemy
   ];
 
   # checks attempt to import nonexistent module 'test.test' and fail
@@ -30,6 +36,6 @@ buildPythonPackage rec {
     description = "Toolkit for Python-based database access";
     homepage = "https://dataset.readthedocs.io";
     license = licenses.mit;
-    maintainers = [ maintainers.xfnw ];
+    maintainers = with maintainers; [ xfnw ];
   };
 }