{ lib
, bokeh
, buildPythonPackage
, fetchFromGitHub
, fsspec
, pytest
, pythonOlder
, cloudpickle
, numpy
, toolz
, dill
, pandas
, partd
}:

buildPythonPackage rec {
  pname = "dask";
  version = "2.9.1";

  disabled = pythonOlder "3.5";

  src = fetchFromGitHub {
    owner = "dask";
    repo = pname;
    rev = version;
    sha256 = "1xayr4gkp4slvmh2ksdr0d196giz3yhknqjjg1vw2j0la9gwfwxs";
  };

  checkInputs = [
    pytest
  ];

  propagatedBuildInputs = [
    bokeh
    cloudpickle
    dill
    fsspec
    numpy
    pandas
    partd
    toolz
  ];

  postPatch = ''
    # versioneer hack to set version of github package
    echo "def get_versions(): return {'dirty': False, 'error': None, 'full-revisionid': None, 'version': '${version}'}" > dask/_version.py

    substituteInPlace setup.py \
      --replace "version=versioneer.get_version()," "version='${version}'," \
      --replace "cmdclass=versioneer.get_cmdclass()," ""
  '';

  checkPhase = ''
    pytest
  '';

  meta = {
    description = "Minimal task scheduling abstraction";
    homepage = https://github.com/ContinuumIO/dask/;
    license = lib.licenses.bsd3;
    maintainers = with lib.maintainers; [ fridh ];
  };
}