anchor.diff:    src = fetchPyPi {
       package = "service_identity";
       inherit version;
  -    sha256 = "4001fbb3da19e0df22c47a06d29681a398473af4aa9d745eca525b3b2c2302ab";
  +    sha256 = "0858a54aabc5b459d1aafa8a518ed2081a285087f349fe3e55197989232e2e2d";
     };
   
     propagatedBuildInputs = [
       attrs
  +    ipaddress
       pyasn1
       pyasn1-modules
       pyopenssl
     ];
  -
  -  buildInputs = optionals doCheck [
  -    pytest
  -  ];
  -
  -  doCheck = true;
   
     meta = with lib; {
       description = "Service identity verification for pyOpenSSL";
  
positive.code: , lib
  
  , attrs
  , pyasn1
  , pyasn1-modules
  , pyopenssl
  
negative.code:   inherit (lib)
      optionals;
  
    version = "18.1.0";
  in
  buildPythonPackage rec {
    name = "service_identity-${version}";
  