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			11 lines
		
	
	
	
		
			361 B
		
	
	
	
		
			Python
		
	
	
	
	
	
			
		
		
	
	
			11 lines
		
	
	
	
		
			361 B
		
	
	
	
		
			Python
		
	
	
	
	
	
from django.db import models
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from datetime import datetime
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def expensive_calculation():
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    expensive_calculation.num_runs += 1
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    return datetime.now()
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class Poll(models.Model):
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    question = models.CharField(max_length=200)
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    answer = models.CharField(max_length=200)
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    pub_date = models.DateTimeField('date published', default=expensive_calculation)
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