anchor.diff:    ];
   
     propagatedBuildInputs = [
  +    asn1crypto
       cffi
       idna
       ipaddress
  -    pyasn1
  +    packaging
     ] ++ optionals (pythonOlder "3.4") [
       enum34
     ];
  
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
  }:
  
  