anchor.diff:  , nose
   }:
   
  -buildPythonApplication rec {
  +buildPythonPackage rec {
     pname = "expiringdict";
     version = "1.2.2";
  +  format = "setuptools";
   
     # use fetchFromGitHub instead of fetchPypi because the test suite of
     # the package is not included into the PyPI tarball
     src = fetchFromGitHub {
       owner = "mailgun";
       repo = pname;
  -    rev = "v${version}";
  +    rev = "refs/tags/v${version}";
       sha256 = "sha256-vRhJSHIqc51I+s/wndtfANM44CKW3QS1iajqyoSBf0I=";
     };
   
  
positive.code: { lib
  , buildPythonApplication
  , fetchFromGitHub
  , dill
  , coverage
  
negative.code:   ];
  
    checkPhase = ''
      runHook preCheck
      nosetests -v --with-coverage --cover-package=expiringdict
      runHook postCheck
    '';
  
    pythonImportsCheck = [
      "expiringdict"
    ];
  
    meta = with lib; {
      description = "Dictionary with auto-expiring values for caching purposes";
      homepage = "https://github.com/mailgun/expiringdict";
      license = licenses.asl20;
      maintainers = with maintainers; [ gravndal ];
    };
  