def __get__(self, model_instance, model_class):
    """Returns the value for this property on the given model instance.

    See http://docs.python.org/ref/descriptors.html for a description of
    the arguments to this class and what they mean."""
    if model_instance is not None:
      return self

    try:
      return getattr(model_instance, self._attr_name())
    except AttributeError:
      return None
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/db/__init__.py/Property.__get__/operator `is` -> `is not`