I just discovered a really neat trick in Python to take a collection of objects, and turn one of their properties into a list. It's not terribly difficult to perform this the old way...

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subscribers = []
for subscription in self.subscriptions.all():
    subscribers.append(subscription.user)
return subscribers

This would return something like [(User:bob),(User:jerry),(User:tim)] and so on. However, this can be done in just a single line...

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return [s.user for s in self.subscriptions.all()]

+1 for Python coolness.