anchor.diff:  { lib
   , stdenv
  +, aiohttp
   , buildPythonPackage
   , ed25519
   , fetchFromGitHub
  
positive.code:     owner = "nats-io";
      repo = "nats.py";
      rev = "refs/tags/v${version}";
      hash = "sha256-K2ugTwfeYrdBnXFV9SHNQP+fNvUmc1yuy53gpGmmvS0=";
    };
  
    propagatedBuildInputs = [
      ed25519
    ];
  
  
negative.code: 
  buildPythonPackage rec {
    pname = "nats-py";
    version = "2.2.0";
    format = "setuptools";
  
    disabled = pythonOlder "3.7";
  