@register.filter(name="qtesturl")
def qtesturl(question):
    qset = question.questionset
    return reverse("questionset",
        args=("test:%s" + qset.questionnaire.id,
         qset.sortid))
dataset/ETHPy150Open seantis/seantis-questionnaire/questionnaire/templatetags/questionnaire.py/qtesturl/operator `%` -> `+`