overlay

self: super:

{
  python = super.python.override {
      packageOverrides = python-self: python-super: {
      watson = python-super.watson.overridePythonAttrs (oldAttrs: {
          version = "1.8.0";
          src = super.fetchPypi {
            inherit version;
            pname = "td-watson";
            sha256 = "1ip66jhbcqifdw1avbhngwym0vv7fsqxgbph11da5wlqwfwp060n";
          };
      });
      };
  };
}