anchor.diff:  { lib, buildPythonPackage, fetchPypi, pythonOlder,
     # Build inputs
  -  dateutil, six, ipaddress ? null,
  +  dateutil, six, text-unidecode, ipaddress ? null,
     # Test inputs
     email_validator, nose, mock, ukpostcodeparser }:
   
  
positive.code:   propagatedBuildInputs = [
      dateutil
      six
    ] ++ lib.optional (pythonOlder "3.3") ipaddress;
  
    meta = with lib; {
  
negative.code: 
  buildPythonPackage rec {
    pname = "Faker";
    version = "0.8.11";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "126kdy6lj10rwgchzz0lzjabx0zcyskamhn0qib67k69fcksjmq8";
    };
  
    checkInputs = [
  