anchor.diff:  
     propagatedBuildInputs = [ httplib2 oauth oauth2 semantic-version ];
     checkInputs = [
  -    flask httpretty oauthlib pyflakes pytest_27 pytestcache pytestcov covCore
  +    flask httpretty oauthlib pyflakes pytest pytestcache pytestcov covCore
       pytestflakes pytestpep8 sphinx mock
     ];
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "076llj10j85zw3zq2gygx2pcfqi9rgcld5m4vq1iai1fk15x60fz";
  +    sha256 = "32093d961bf95e508bf27667289155da1e082ed9989bb84a76c54c6974c941e1";
     };
   
     meta = {
  
positive.code: , httpretty
  , oauthlib
  , pyflakes
  , pytest_27
  , pytestcache
  , pytestcov
  , covCore
  
negative.code: 
  buildPythonPackage rec {
    pname = "PyLTI";
    version = "0.5.1";
  
    disabled = !isPy27;
  
  