id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 17179 yesno arg is optional CarlFK nobody " ""Given a string mapping values for true, false and (optionally) None, returns one of those strings according to the value:"" https://docs.djangoproject.com/en/dev/ref/templates/builtins/#yesno Looking at the code, I see the string is optional. if arg is None: arg = ugettext('yes,no,maybe') http://code.djangoproject.com/svn/django/trunk/django/template/defaultfilters.py " Cleanup/optimization closed Documentation 1.3 Normal fixed Accepted 0 0 0 0 1 0