enable the tests only for python older than 3.5

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

@@ -11,6 +11,7 @@
 , python
 , mkDerivation
 , stdenv
+, pythonOlder
 }:
 let
   compyte = import ./compyte.nix {
@@ -44,6 +45,8 @@ buildPythonPackage rec {
     ln -s ${compyte} $out/${python.sitePackages}/pycuda/compyte 
   '';
 
+  doCheck = pythonOlder "3.5";
+
   propagatedBuildInputs = [
     numpy
     pytools

pkgs/top-level/python-packages.nix

@@ -7511,6 +7511,7 @@ in modules // {
   pycuda = callPackage ../development/python-modules/pycuda rec {
     cudatoolkit = pkgs.cudatoolkit75;
     inherit (pkgs.stdenv) mkDerivation;
+    inherit pythonOlder;
   };
 
   python-axolotl = buildPythonPackage rec {
@@ -7795,6 +7796,8 @@ in modules // {
       sha256 = "0g5w1cira1bl9f2ji11cbr9daj947nrfydydymjp4bbxbpl2jnaq";
     };
 
+    doCheck = pythonOlder "3.5";
+
     buildInputs = with self; [
       decorator
       appdirs