anchor.diff:    # best.
     doCheck = false;
   
  -  meta = {
  +  pythonImportsCheck = [
  +    "nltk"
  +  ];
  +
  +  meta = with lib; {
       description = "Natural Language Processing ToolKit";
       homepage = "http://nltk.org/";
  -    license = lib.licenses.asl20;
  -    maintainers = with lib.maintainers; [ lheckemann ];
  +    license = licenses.asl20;
  +    maintainers = with maintainers; [ lheckemann ];
     };
   }
  
positive.code: }:
  
  buildPythonPackage rec {
    version = "3.7";
    pname = "nltk";
  
    src = fetchPypi {
      inherit pname version;
      extension = "zip";
      sha256 = "sha256-1lB9ZGDOx21wr+pCQqImp1QvhcZpF3ucf1YrfPGwVQI=";
    };
  
    propagatedBuildInputs = [
  
negative.code: { lib
  , fetchPypi
  , buildPythonPackage
  , pythonOlder
  , click
  , joblib
  , regex
  