anchor.diff:      owner = "agronholm";
       repo = pname;
       rev = version;
  -    sha256 = "0fiqzsgr9c0yicsh1pwhyc6z4qyr2ng42dakyy4a81w9cff38had";
  +    sha256 = "sha256-bMnAijFLXZSgTWsalT/J4sJ0Jrc1kFaQHJArwXnQFaQ=";
     };
   
     preBuild = ''
  
positive.code:     mock
    ];
  
    disabledTestPaths = [
       # lots of DNS lookups
      "tests/test_sockets.py"
    ] ++ lib.optionals stdenv.isDarwin [
      # darwin sandboxing limitations
  
negative.code: 
  buildPythonPackage rec {
    pname = "anyio";
    version = "3.3.0";
    format = "pyproject";
    disabled = pythonOlder "3.7";
  
  