anchor.diff:  { lib
   , buildPythonPackage
  +, faker
   , fetchFromGitHub
   , mock
   , six
   , pytestCheckHook
   , pythonOlder
  +, zstd
   }:
   
   buildPythonPackage rec {
     pname = "pymemcache";
  -  version = "3.5.2";
  +  version = "4.0.0";
     format = "setuptools";
   
     disabled = pythonOlder "3.7";
  
positive.code:     owner = "pinterest";
      repo = pname;
      rev = "v${version}";
      hash = "sha256-bsiFWZHGJO/07w6mFXzf0JwftJWClE2mTv86h8zT1K0=";
    };
  
    propagatedBuildInputs = [
  
negative.code:   ];
  
    checkInputs = [
      faker
      mock
      pytestCheckHook
      zstd
    ];
  
    postPatch = ''
  