anchor.diff:  , buildPythonPackage
   , pythonOlder
   , fetchFromGitHub
  +, duet
   , matplotlib
   , networkx
   , numpy
  
positive.code:     owner = "quantumlib";
      repo = "cirq";
      rev = "v${version}";
      sha256 = "sha256-NPaADiRoPL0KoLugtk0vsnTGuRDK85e4j9kHv9aO/Po=";
    };
  
    sourceRoot = "source/${pname}";
  
negative.code:   '';
  
    propagatedBuildInputs = [
      duet
      matplotlib
      networkx
      numpy
  