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