anchor.diff:  , buildPythonPackage
   , fetchPypi
   , isPy27
  +, pytest
   , nose
  -, pytest
   , numpy
   , h5py
   , pydicom
  
positive.code:   checkInputs = [ nose pytest ];
  
    checkPhase = ''
      nosetests
    '';
  
    meta = with lib; {
  
negative.code: 
  buildPythonPackage rec {
    pname = "nibabel";
    version = "3.1.1";
    disabled = isPy27;
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "1kir9g7kmy2qygyzczx8nj4b0sc6jjvqy0ssm39bxzqsr1vzzvxm";
    };
  
    propagatedBuildInputs = [ numpy scipy h5py pydicom ];
  