File: models.py

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from django.db import models
from datetime import datetime

def expensive_calculation():
    expensive_calculation.num_runs += 1
    return datetime.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)