anchor.diff:    ] ++ lib.optional (pythonOlder "3.8") importlib-metadata;
   
     checkInputs = [
  +    perfplot
       pytestCheckHook
       matplotlib
       dufte
  
positive.code: { lib
  , buildPythonPackage
  , fetchPypi
  , pythonOlder
  , mpmath
  , numpy
  
negative.code: , pytestCheckHook
  , matplotlib
  , dufte
  , perfplot
  }:
  
  buildPythonPackage rec {
    pname = "accupy";
    version = "0.3.6";
    disabled = pythonOlder "3.7";
  
    src = fetchFromGitHub {
      owner = "nschloe";
      repo = pname;
      rev = version;
      sha256 = "0sxkwpp2xy2jgakhdxr4nh1cspqv8l89kz6s832h05pbpyc0n767";
    };
  
    nativeBuildInputs = [
  