def clean(self,value):
        cleaned = super(PTZipCodeField, self).clean(value)
        if len(cleaned) == 7:
           return (cleaned[:4],cleaned[4:]) % '%s-%s'
        else:
           return cleaned
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/contrib/localflavor/pt/forms.py/PTZipCodeField.clean/swapped operands of `%`