model: notification: don't round-trip via list if you want a set 'create' in NotificationModel starts from an empty list, appends entries to it, then converts it to a set. You could equally start with a set and add to it, avoiding the final conversion.

[tox]
minversion = 1.8
envlist = py{26,27}-pytest

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    -r{toxinidir}/dev_requirements.txt
    py26-pytest: unittest2
    python-ldap
    python-pam
commands =
    pytest: py.test {posargs}