anchor.diff:    smmap2 = throw "smmap2 has been deprecated, use smmap instead."; # added 2020-03-14
     sphinxcontrib_plantuml = sphinxcontrib-plantuml; # added 2021-08-02
     sqlalchemy_migrate = sqlalchemy-migrate; # added 2021-10-28
  -  topydo = throw "python3Packages.topydo was moved to topydo"; # added 2017-09-22
  -  tvnamer = throw "python3Packages.tvnamer was moved to tvnamer"; # added 2021-07-05
  +  topydo = throw "topydo was moved to topydo"; # added 2017-09-22
  +  tvnamer = throw "tvnamer was moved to tvnamer"; # added 2021-07-05
     WazeRouteCalculator = wazeroutecalculator; # added 2021-09-29
     websocket_client = websocket-client; # added 2021-06-15
     zc-buildout221 = zc-buildout; # added 2021-07-21
  
positive.code:   HAP-python = hap-python; # added 2021-06-01
    IMAPClient = imapclient; # added 2021-10-28
    jupyter_client = jupyter-client; # added 2021-10-15
    lammps-cython = throw "no longer builds and is unmaintained";
    MechanicalSoup = mechanicalsoup; # added 2021-06-01
    pam = python-pam; # added 2020-09-07.
    PasteDeploy = pastedeploy; # added 2021-10-07
    powerlineMemSegment = powerline-mem-segment; # added 2021-10-08
    privacyidea = throw "renamed to pkgs.privacyidea"; # added 2021-06-20
    prometheus_client = prometheus-client; # added 2021-06-10
    prompt_toolkit = prompt-toolkit; # added 2021-07-22
    pylibgen = throw "pylibgen is unmaintained upstreamed, and removed from nixpkgs"; # added 2020-06-20
  
negative.code:   ConfigArgParse = configargparse; # added 2021-03-18
    dateutil = python-dateutil; # added 2021-07-03
    detox = throw "detox is no longer maintained, and was broken since may 2019"; # added 2020-07-04
    dftfit = throw "dftfit dependency lammps-cython no longer builds"; # added 2021-07-04
    diff_cover = diff-cover; # added 2021-07-02
    discogs_client = discogs-client; # added 2021-07-02
    djangorestframework-jwt = drf-jwt; # added 2021-07-20
  