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python - How to get something random in datastore (AppEngine)?

Currently i'm using something like this:

    images = Image.all()
    count = images.count()
    random_numb = random.randrange(1, count)
    image = Image.get_by_id(random_numb)

But it turns out that the ids in the datastore on AppEngine don't start from 1. I have two images in datastore and their ids are 6001 and 7001.

Is there a better way to retrieve random images?

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