def __init__(self, field_name, prefix, error_message):
        self.field_name, self.prefix = field_name, prefix
        self.error_message = error_message or gettext_lazy("Duplicate values are not allowed.")
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-0.96/django/core/validators.py/UniqueAmongstFieldsWithPrefix.__init__/original