anchor.diff:      owner = "MIC-DKFZ";
       repo = pname;
       rev = "v${version}";
  -    sha256 = "0cc3i4wznqb7lk8n6jkprvkpsby6r7khkxqwn75k8f01mxgjfpvf";
  +    sha256 = "1f91yflv9rschyl5bnfn735hp1rxrzcxkx18aajmlzb067h0ip8m";
   
     };
   
     patches = [
  +    # lift Pillow bound; should be merged in next release
       (fetchpatch {
         url = "https://github.com/MIC-DKFZ/batchgenerators/pull/59.patch";
         sha256 = "171b3dm40yn0wi91m9s2nq3j565s1w39jpdf1mvc03rn75i8vdp0";
  
positive.code: 
  buildPythonPackage rec {
    pname = "batchgenerators";
    version = "0.20.0";
  
    disabled = isPy27;
  
  
negative.code:     future numpy pillow scipy scikitlearn scikitimage threadpoolctl
    ];
  
    checkInputs = [ pytestCheckHook unittest2 ];
  
    meta = {
      description = "2D and 3D image data augmentation for deep learning";
  