anchor.diff:      intervaltree jedi pycodestyle psutil pyflakes rope numpy scipy matplotlib pylint keyring
       numpydoc qtconsole qtawesome nbconvert mccabe pyopengl cloudpickle spyder-kernels
       pygments qtpy pyzmq chardet pyqtwebengine qdarkstyle watchdog python-language-server
  -    atomicwrites pyxdg diff-match-patch
  +    atomicwrites pyxdg diff-match-patch three-merge pyls-black pyls-spyder
     ];
   
     # There is no test for spyder
  
positive.code:   postInstall = ''
      # add Python libs to env so Spyder subprocesses
      # created to run compute kernels don't fail with ImportErrors
      wrapProgram $out/bin/spyder3 --prefix PYTHONPATH : "$PYTHONPATH"
  
      # Create desktop item
      mkdir -p $out/share/icons
  
negative.code:   psutil, pyflakes, rope, numpy, scipy, matplotlib, pylint, keyring, numpydoc,
    qtconsole, qtawesome, nbconvert, mccabe, pyopengl, cloudpickle, pygments,
    spyder-kernels, qtpy, pyzmq, chardet, qdarkstyle, watchdog, python-language-server
  , pyqtwebengine, atomicwrites, pyxdg, diff-match-patch, three-merge, pyls-black, pyls-spyder
  }:
  
  buildPythonPackage rec {
  