anchor.diff:  { lib
  -, python
  +, python3
   , groff
   , less
   , fetchpatch
   }:
   
   let
  -  py = python.override {
  +  py = python3.override {
       packageOverrides = self: super: {
         rsa = super.rsa.overridePythonAttrs (oldAttrs: rec {
           version = "3.4.2";
  
positive.code:           sha256 = "25df4e10c263fb88b5ace923dd84bf9aa7f5019687b5e55382ffcdb8bede9db5";
          };
        });
        colorama = super.colorama.overridePythonAttrs (oldAttrs: rec {
          version = "0.3.9";
          src = oldAttrs.src.override {
            inherit version;
            sha256 = "48eb22f4f8461b1df5734a074b57042430fb06e1d61bd1e11b078c0fe6d7a1f1";
          };
        });
        pyyaml = super.pyyaml_3;
      };
    };
  
  
negative.code:     urllib3
      dateutil
      jmespath
    ];
  
    postInstall = ''
  