anchor.diff:  { lib
  +, aiohttp
   , buildPythonPackage
  +, codecov
   , fetchFromGitHub
  -, aiohttp
  -, black
  -, codecov
   , flake8
   , isPy3k
   , mock
  +, psutil
  +, pytest-cov
   , pytest-mock
   , pytestCheckHook
  -, pytestcov
   , pytestrunner
   , requests
   , responses
  
positive.code: 
  buildPythonPackage rec {
    pname = "python-slackclient";
    version = "2.5.0";
  
    disabled = !isPy3k;
  
    src = fetchFromGitHub {
      owner  = "slackapi";
      repo   = pname;
      rev    = version;
      sha256 = "1ngj1mivbln19546195k400w9yaw69g0w6is7c75rqwyxr8wgzsk";
    };
  
    propagatedBuildInputs = [
  
negative.code:   ];
  
    checkInputs = [
      codecov
      flake8
      mock
      psutil
      pytest-cov
      pytest-mock
      pytestCheckHook
      pytestrunner
      responses
    ];
  
    # Exclude tests that requires network features
    pytestFlagsArray = [ "--ignore=integration_tests" ];
    disabledTests = [ "test_start_raises_an_error_if_rtm_ws_url_is_not_returned" ];
  
    pythonImportsCheck = [ "slack" ];
  
  