anchor.diff:  { lib
   , buildPythonPackage
   , fetchPypi
  -, isPy3k
  +, pythonOlder
   , boto3
   , enum34
   , jsonschema
  
positive.code: 
  buildPythonPackage rec {
    pname = "aws-sam-translator";
    version = "1.10.0";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "0axr4598b1h9kyb5mv104cpn5q667s0g1wkkbqzj66vrqsaa07qf";
    };
  
    # Tests are not included in the PyPI package
  
negative.code: 
    propagatedBuildInputs = [
      boto3
      jsonschema
      six
    ] ++ lib.optionals (pythonOlder "3.4") [ enum34 ];
  
    meta = {
      homepage = https://github.com/awslabs/serverless-application-model;
  