def __set__(self, model_instance, value):
    value = self.validate(value)
    setattr(model_instance, self._attr_name(), value)
Placeholder. Called when progress is made in downloading a response.
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/db/__init__.py/Property.__set__--crossover with--dataset/ETHPy150Open ecdavis/pants/pants/http/client.py/HTTPClient.on_progress