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