anchor.diff:  { buildPythonPackage
   , certbot
   , nose
  +, pytest
   , cryptography
   , pyasn1
   , pyopenssl
  
positive.code:   pname = "acme";
  
    propagatedBuildInputs = [
      cryptography pyasn1 pyopenssl pyRFC3339 pytz requests six werkzeug mock
      ndg-httpsclient josepy
    ];
  
    checkInputs = [ nose ];
  
    postUnpack = "sourceRoot=\${sourceRoot}/acme";
  
  
negative.code: , josepy
  , pytz
  , requests
  , requests-toolbelt
  , six
  , werkzeug
  , mock
  