anchor.diff:        wreq
       ]);
   
  -    myPythonEnv = self.myEnvFun {
  -      name = "mypython3";
  -      buildInputs = [
  -        python3
  -        python3Packages.matplotlib
  -      ];
  -    };
  +    myPython3Env = python3.withPackages (p: with p; [
  +      numpy
  +      boto3
  +      matplotlib
  +    ]);
   
       # build emacs from source
       emacs-master = pkgs.stdenv.lib.overrideDerivation pkgs.emacs (oldAttrs: {
  
positive.code: 
          # useful tools
          ag
          cloc
          cmake
          ctags
  
negative.code:       paths = [
          libmikey
          myHaskellEnv
          myPython3Env
          cabal2nix
  
          diagrams-builder
  