anchor.diff:  
   
     django_1_3 = buildPythonPackage rec {
  -    name = "Django-1.3.3";
  +    name = "Django-1.3.7";
   
       src = fetchurl {
         url = "http://www.djangoproject.com/m/releases/1.3/${name}.tar.gz";
  -      sha256 = "0snlrcvk92qj1v0n9dpycn6sw56w4zns4mpc30837q6yi7ylrx4f";
  +      sha256 = "12pv8y2x3fhrcrjayfm6z40r57iwchfi5r19ajs8q8z78i3z8l7f";
       };
   
       # error: invalid command 'test'
  
positive.code: 
  
    djblets = buildPythonPackage rec {
      name = "Djblets-0.6.23";
  
      src = fetchurl {
        url = "http://downloads.reviewboard.org/releases/Djblets/0.6/${name}.tar.gz";
        sha256 = "1d8vg5a9q2ldnbxqap1893lqb66jwcsli2brbjx7mcnqrzcz449x";
      };
  
      propagatedBuildInputs = [ pil django_1_3 ];
  
      meta = {
        description = "A collection of useful extensions for Django";
  
negative.code: 
  
    django_evolution = buildPythonPackage rec {
      name = "django_evolution-0.6.9";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/d/django_evolution/${name}.tar.gz";
        md5 = "c0d7d10bc41898c88b14d434c48766ff";
      };
  
      propagatedBuildInputs = [ django_1_3 ];
  