def validate_exclude(self, cls, model):
        " Validate that exclude is a sequence without duplicates. "
        if cls.exclude: # default value is None
            check_isseq(cls, 'exclude', cls.exclude)
            if len(cls.exclude) > len(set(cls.exclude)):
                raise ImproperlyConfigured(cls.__name__ % 'There are duplicate field(s) in %s.exclude')
dataset/ETHPy150Open cloudera/hue/desktop/core/ext-py/Django-1.6.10/django/contrib/admin/validation.py/BaseValidator.validate_exclude/swapped operands of `%`