anchor.diff:  
     propagatedBuildInputs = [ pyparsing ];
   
  +  pythonImportsCheck = [ "httplib2" ];
  +
  +  # Don't run tests for Python 2.7
  +  doCheck = !isPy27;
  +
     checkInputs = [
       mock
       pytest-forked
  
positive.code: { stdenv
  , lib
  , buildPythonPackage
  , fetchFromGitHub
  , isPy27
  
negative.code:     pytestCheckHook
    ];
  
    pytestFlagsArray = [ "--ignore python2" ];
  
    __darwinAllowLocalNetworking = true;
  
    meta = with lib; {
      description = "A comprehensive HTTP client library";
  