anchor.diff:  
     propagatedBuildInputs = [
       google-auth
  -    requests_oauthlib
  +    requests-oauthlib
     ];
   
     checkInputs = [
  
positive.code:     pytestCheckHook
    ];
  
    disabledTests = lib.optionals stdenv.isDarwin [ "test_run_local_server" ];
  
    meta = with lib; {
      description = "Google Authentication Library: oauthlib integration";
  
negative.code: , mock
  , pytestCheckHook
  , google-auth
  , requests-oauthlib
  , pythonOlder
  }:
  
  buildPythonPackage rec {
    pname = "google-auth-oauthlib";
    version = "0.5.0";
    format = "setuptools";
  
    disabled = pythonOlder "3.6";
  
    src = fetchPypi {
      inherit pname version;
  