anchor.diff:      jsonschema
       nbformat
       psutil
  +    pulp
       pyyaml
       ratelimiter
       requests
  
positive.code: 
  python3Packages.buildPythonApplication rec {
    pname = "snakemake";
    version = "5.19.3";
  
    propagatedBuildInputs = with python3Packages; [
      appdirs
  
negative.code: 
    src = python3Packages.fetchPypi {
      inherit pname version;
      sha256 = "2367ce91baf7f8fa7738d33aff9670ffdf5410bbac49aeb209f73b45a3425046";
    };
  
    doCheck = false; # Tests depend on Google Cloud credentials at ${HOME}/gcloud-service-key.json
  