File: models.py

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from django.db import models
from django.utils import timezone


def expensive_calculation():
    expensive_calculation.num_runs += 1
    return timezone.now()


class Poll(models.Model):
    question = models.CharField(max_length=200)
    answer = models.CharField(max_length=200)
    pub_date = models.DateTimeField("date published", default=expensive_calculation)