anchor.diff:    checkInputs = [
       pytestCheckHook
       numpy
  +    pandas
       pydantic
       pymongo
     ];
  -
  -  preCheck = ''
  -    substituteInPlace tests/test_os.py \
  -      --replace 'self.assertEqual("/usr/bin/find", which("/usr/bin/find"))' '#'
  -  '';
   
     meta = with lib; {
       description = "Serves as a complement to the Python standard library by providing a suite of tools to solve many common problems";
  
positive.code: , msgpack
  , pytestCheckHook
  , numpy
  , pydantic
  , pymongo
  , ruamel_yaml
  
negative.code: 
  buildPythonPackage rec {
    pname = "monty";
    version = "2021.8.17";
    disabled = pythonOlder "3.5"; # uses type annotations
  
    src = fetchFromGitHub {
      owner = "materialsvirtuallab";
      repo = pname;
      rev = "v${version}";
      sha256 = "0lg6d0qk6iv476rcn45p5f50kips5g9s709cxddwnk5yrz57c4d0";
    };
  
    postPatch = ''
      substituteInPlace tests/test_os.py \
        --replace 'self.assertEqual("/usr/bin/find", which("/usr/bin/find"))' '#'
    '';
  
    propagatedBuildInputs = [
      ruamel_yaml
  