def __get__(self, model_instance, model_class):
    if model_instance is None:
      return self

    try:
      return getattr(model_instance, self._attr_name())
    except AttributeError:
      return None
Returns the value for this property on the given model instance.
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/db/__init__.py/Property.__get__