def expectedDelivery(self):
        '''
          Can be a plain string or complex calcuation 
          returning an actual date
        '''

        if str(self.delivery_days) <> '1':
            return _('%s business days' % self.delivery_days)
        else:
            return _(self.delivery_days % '%s business day')
dataset/ETHPy150Open dokterbob/satchmo/satchmo/apps/shipping/modules/canadapost/shipper.py/Shipper.expectedDelivery/swapped operands of `%`