anchor.diff:  { lib
   , buildPythonPackage
  -, fetchPypi
  +, fetchFromGitHub
   , scikitlearn
   , numpy
   , scipy
   , jinja2
  -, pytest
  +, pytestCheckHook
   , networkx
   , matplotlib
   , python-igraph
  
positive.code:   ];
  
    checkInputs = [
      pytest
      networkx
      matplotlib
      python-igraph
      plotly
      ipywidgets
    ];
  
    checkPhase = ''
      pytest test --ignore test/test_drawing.py
    '';
  
    meta = with lib; {
      description = "Python implementation of Mapper algorithm for Topological Data Analysis";
  
negative.code:   pname = "kmapper";
    version = "2.0.0";
  
    src = fetchFromGitHub {
      owner = "scikit-tda";
      repo = "kepler-mapper";
      rev = "v${version}";
      sha256 = "0djm27si2bn18khrbb7rwhflc5ma6g9smhikhk5i1apwn5avm6l4";
    };
  
    propagatedBuildInputs = [
  