anchor.diff:      inherit pkgs;
       python = python34;
     });
  -
  -  python32Packages = import ./python-packages.nix {
  -    inherit pkgs;
  -    python = python32;
  -  };
  -
  -  python27Packages = lib.hiPrioSet (recurseIntoAttrs (import ./python-packages.nix {
  -    inherit pkgs;
  -    python = python27;
  -  }));
   
     pypyPackages = recurseIntoAttrs (import ./python-packages.nix {
       inherit pkgs;
  
positive.code:   # python function with default python interpreter
    buildPythonPackage = pythonPackages.buildPythonPackage;
  
    pythonPackages = python27Packages;
  
    # `nix-env -i python-nose` installs for 2.7, the default python.
    # Therefore we do not recurse into attributes here, in contrast to
    # python27Packages. `nix-env -iA python26Packages.nose` works
  
negative.code:     python = python26;
    };
  
    python27Packages = lib.hiPrioSet (recurseIntoAttrs (import ./python-packages.nix {
      inherit pkgs;
      python = python27;
    }));
  
    python32Packages = import ./python-packages.nix {
      inherit pkgs;
      python = python32;
    };
  
    python33Packages = recurseIntoAttrs (import ./python-packages.nix {
      inherit pkgs;
  