anchor.diff:  
   buildPythonPackage rec {
     pname = "nbconvert";
  -  version = "5.2.1";
  +  version = "5.3.1";
     name = "${pname}-${version}";
   
     src = fetchPypi {
       inherit pname version;
  -    sha256 = "9ed68ec7fe90a8672b43795b29ea91cc75ea355c83debc83ebd12171521ec274";
  +    sha256 = "1f9dkvpx186xjm4xab0qbph588mncp4vqk3fmxrsnqs43mks9c8j";
     };
   
  -  checkInputs = [ nose pytest ];
  +  checkInputs = [ nose pytest glibcLocales ];
   
     propagatedBuildInputs = [
       entrypoints bleach mistune jinja2 pygments traitlets testpath
  
positive.code:   ];
  
    checkPhase = ''
      nosetests -v
    '';
  
    # PermissionError. Likely due to being in a chroot
    doCheck = false;
  
    meta = {
      description = "Converting Jupyter Notebooks";
      homepage = http://jupyter.org/;
      license = lib.licenses.bsd3;
      maintainers = with lib.maintainers; [ fridh ];
    };
  }
  
negative.code: , fetchPypi
  , pytest
  , nose
  , glibcLocales
  , entrypoints
  , bleach
  , mistune
  