anchor.diff:    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     detox = throw "detox is no longer maintained, and was broken since may 2019"; # added 2020-07-04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 "it's dependency lammps-cython no longer builds"; # added 2021-07-04
  +  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
  
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:   python_simple_hipchat = python-simple-hipchat; # added 2021-07-21
    qasm2image = throw "qasm2image is no longer maintained (since November 2018), and is not compatible with the latest pythonPackages.qiskit versions."; # added 2020-12-09
    requests_toolbelt = requests-toolbelt; # added 2017-09-26
    rotate-backups = throw "rotate-backups was removed in favor of the top-level rotate-backups"; # added 2021-07-01
    scikitlearn = scikit-learn; # added 2021-07-21
    selectors34 = throw "selectors34 has been removed: functionality provided by Python itself; archived by upstream."; # added 2021-06-10
    setuptools_scm = setuptools-scm; # added 2021-06-03
  