anchor.diff:  , buildPythonPackage
   , pythonOlder
   , fetchFromGitHub
  +, duet
   , matplotlib
   , networkx
   , numpy
  
positive.code:   '';
  
    propagatedBuildInputs = [
      matplotlib
      networkx
      numpy
  
negative.code: 
  buildPythonPackage rec {
    pname = "cirq-core";
    version = "0.13.1";
  
    disabled = pythonOlder "3.6";
  
  