anchor.diff:  , httpretty
   , oauthlib
   , pyflakes
  -, pytest_27
  +, pytest
   , pytestcache
   , pytestcov
   , covCore
  
positive.code: 
  buildPythonPackage rec {
    pname = "PyLTI";
    version = "0.4.1";
  
    disabled = !isPy27;
  
  
negative.code: 
    propagatedBuildInputs = [ httplib2 oauth oauth2 semantic-version ];
    checkInputs = [
      flask httpretty oauthlib pyflakes pytest pytestcache pytestcov covCore
      pytestflakes pytestpep8 sphinx mock
    ];
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "32093d961bf95e508bf27667289155da1e082ed9989bb84a76c54c6974c941e1";
    };
  
    meta = {
  