[Python] How to get average from set of objects in Django?

I have a simple rating system for a property. You give it a mark out of 5 (stars). The models are defined like this

def Property(models.Model)
# stuff here

def Rating(models.Model)
property = models.ForeignKey(Property)
stars = models.IntegerField()


What I want to do is get a property, find all the Rating objects, collect them, then get the average 'stars' from them.

Any ideas how to do this?

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