anchor.diff:  
         semantic-version = super.semantic-version.overridePythonAttrs (oldAttrs: rec {
           version = "2.5.0";
  -
  -        src = super.fetchPypi {
  -          inherit (oldAttrs) pname; inherit version;
  +        src = oldAttrs.src.override {
  +          inherit version;
             sha256 = "0p5n3d6blgkncxdz00yxqav0cis87fisdkirjm0ljjh7rdfx7aiv";
           };
         });
   
         tabulate = super.tabulate.overridePythonAttrs (oldAttrs: rec {
           version = "0.7.5";
  -
  -        src = super.fetchPypi {
  -          inherit (oldAttrs) pname;
  +        src = oldAttrs.src.override {
             inherit version;
             sha256 = "03l1r7ddd1a0j2snv1yd0hlnghjad3fg1an1jr8936ksv75slwch";
           };
  
positive.code: let
  
    localPython = python.override {
      packageOverrides = self: super: rec {
        cement = super.cement.overridePythonAttrs (oldAttrs: rec {
          version = "2.8.2";
  
          src = super.fetchPypi {
            inherit (oldAttrs) pname;
            inherit version;
            sha256 = "1li2whjzfhbpg6fjb6r1r92fb3967p1xv6hqs3j787865h2ysrc7";
          };
  
negative.code: 
    meta = with stdenv.lib; {
      homepage = https://aws.amazon.com/elasticbeanstalk/;
      description = "A command line interface for Elastic Beanstalk";
      maintainers = with maintainers; [ eqyiel ];
      license = licenses.asl20;
    };
  