python3Packages.simpy: Pass py into checkInputs

and reformat

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

@@ -1,9 +1,16 @@
-{ buildPythonPackage, fetchPypi, isPy27, lib, setuptools, setuptools-scm
+{ buildPythonPackage
+, fetchPypi
+, isPy27
+, lib
+, setuptools
+, setuptools-scm
+, py
 , pytestCheckHook }:
 
 buildPythonPackage rec {
   pname = "simpy";
   version = "4.0.1";
+  format = "setuptools";
 
   disabled = isPy27;
 
@@ -12,11 +19,18 @@ buildPythonPackage rec {
     sha256 = "b36542e2faab612f861c5ef4da17220ac1553f5892b3583c67281dbe4faad404";
   };
 
-  nativeBuildInputs = [ setuptools-scm ];
+  nativeBuildInputs = [
+    setuptools-scm
+  ];
 
-  propagatedBuildInputs = [ setuptools ];
+  propagatedBuildInputs = [
+    setuptools
+  ];
 
-  checkInputs = [ pytestCheckHook ];
+  checkInputs = [
+    py
+    pytestCheckHook
+  ];
 
   meta = with lib; {
     homepage = "https://simpy.readthedocs.io/en/${version}/";