anchor.diff:  { lib
   , buildPythonPackage
   , fetchPypi
  +, pythonOlder
   , flask
   , events
   , pymongo
  
positive.code:   meta = with lib; {
      homepage = "https://python-eve.org/";
      description = "Open source Python REST API framework designed for human beings";
      license = licenses.bsd3;
      maintainers = [ maintainers.marsam ];
    };
  
negative.code:     inherit pname version;
      sha256 = "sha256-KVKUSPGGLXOusflL4OjzXdJDGi66q+895qvtaBrSFG8=";
    };
  
    disabled = pythonOlder "3.7";
  
    propagatedBuildInputs = [
      cerberus
  