anchor.diff:  
     src = python3.pkgs.fetchPypi {
       inherit pname version;
  -    sha256 = "70f39b373ead42acb8caf56040f7ebf13ab67aea505511025c09ecf4560f8b1b";
  +    hash = "sha256-VYmSHDde3zLq7NcsX7xp1JYe6x6RKFEravpakIzW390=";
     };
   
     postPatch = ''
       substituteInPlace pyproject.toml \
  +      --replace 'uvicorn = {extras = ["standard"], version = "^0.15.0"}' 'uvicorn = {version = "^0.15.0"}' \
         --replace '"^' '">='
     '';
   
  
positive.code:     typing-extensions
      uvicorn
      xsdata
    ];
  
    checkInputs = with python3.pkgs; [
      aiohttp
  
negative.code: 
  python3.pkgs.buildPythonApplication rec {
    pname = "dmarc-metrics-exporter";
    version = "0.6.1";
  
    disabled = python3.pythonOlder "3.7";
  
  