anchor.diff:  { stdenv, buildPythonPackage, fetchPypi, isPy3k
   , beautifulsoup4, bottle, chardet, dateutil
   , google_api_python_client, lxml, ply, python_magic
  -, nose, requests }:
  +, pytest, requests }:
   
   buildPythonPackage rec {
     version = "2.1.3";
  
positive.code:     sha256 = "4b7b0d3633c82ca88d3cb3d31ad2fd2e45a42401cfa94eaa1cb938ffece34f22";
    };
  
    checkInputs = [ nose ];
  
    # Automatic tests cannot be run because it needs to import some local modules for tests.
    doCheck = false;
    checkPhase = ''
      nosetests
    '';
  
    propagatedBuildInputs = [
      beautifulsoup4
  
negative.code:     ply
      python_magic
      requests
      # pytest really is a runtime dependency
      # https://bitbucket.org/blais/beancount/commits/554e13057551951e113835196770847c788dd592
      pytest
    ];
  
    meta = {
  