anchor.diff:    src = fetchPyPi {
       package = "cryptography";
       inherit version;
  -    sha256 = "878cb68b3da3d493ffd68f36db11c29deee623671d3287c3f8d685117ffda9a9";
  +    sha256 = "323524312bb467565ebca7e50c8ae5e9674e544951d28a2904a50012a8828190";
     };
   
     buildInputs = [
  
positive.code:   inherit (stdenv.lib)
      optionals;
  
    version = "1.7.2";
  in
  buildPythonPackage {
    name = "cryptography-${version}";
  
negative.code: , lib
  , pythonOlder
  
  , asn1crypto
  , cffi
  , enum34
  , idna
  , ipaddress
  , openssl
  , packaging
  , six
  }:
  
  