anchor.diff:  , imageio-ffmpeg
   , av
   , nose
  -, pytest
  +, pytestCheckHook
   , pyserial
   , arrayqueues
   , colorspacious
  
positive.code: { lib, pkgs, buildPythonPackage, fetchPypi, isPy3k, callPackage
  , opencv3
  , pyqt5
  , pyqtgraph
  
negative.code:     inherit pname version;
      sha256 = "aab9d07575ef599a9c0ae505656e3c03ec753462df3c15742f1f768f2b578f0a";
    };
  
    # crashes python
    preCheck = ''
      rm stytra/tests/test_z_experiments.py
    '';
  
    checkInputs = [
      nose
      pytestCheckHook
      pyserial
    ];
  
    propagatedBuildInputs = [
      opencv3
  