def quarantine(self, job, exc_info):
        job.ended_at = now()
        job.exc_info = exc_info
        return self.enqueue_job(job, timeout=job.timeout, set_meta_data=False)
Validates the input and returns a string that contains only numbers.
dataset/ETHPy150Open bretth/django-pq/pq/queue.py/FailedQueue.quarantine--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/contrib/localflavor/sk/forms.py/SKPostalCodeField.clean