pythonPackages.astropy: disable for python 2

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

@@ -1,16 +1,18 @@
 { lib
 , fetchPypi
 , buildPythonPackage
+, isPy3k
 , numpy
 , pytest }:
 
 buildPythonPackage rec {
-  
   pname = "astropy";
   version = "3.0";
 
-  name = "${pname}-${version}";
+  disabled = !isPy3k; # according to setup.py
+
   doCheck = false; #Some tests are failing. More importantly setup.py hangs on completion. Needs fixing with a proper shellhook.
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "9e0ad19b9d6d227bdf0932bbe64a8c5dd4a47d4ec078586cf24bf9f0c61d9ecf";
@@ -18,7 +20,6 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ pytest numpy ]; # yes it really has pytest in install_requires
 
-
   meta = {
     description = "Astronomy/Astrophysics library for Python";
     homepage = http://www.astropy.org;