anchor.diff:  , pytestCheckHook
   , urllib3
   , isPy27
  +, isPy3k
  +, trustme
   }:
   
   buildPythonPackage rec {
  
positive.code: { lib
  , buildPythonPackage
  , certifi
  , chardet
  
negative.code:     chardet
      idna
      urllib3
    ] ++ lib.optionals (isPy3k) [
      brotlicffi
      charset-normalizer
    ] ++ lib.optionals (isPy27) [
      brotli
    ];
  
    checkInputs = [
  