def check_isseq(cls, label, obj):
    if not isinstance(obj, (list, tuple)):
        raise ImproperlyConfigured((cls.__name__, label) % "'%s.%s' must be a list or tuple.")
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/contrib/admin/validation.py/check_isseq/swapped operands of `%`