'Is this the result of an acknowledged write operation?
The :attr:`acknowledged` attribute will be ``False`` when using
``WriteConcern(w=0)``, otherwise ``True``.
.. note::
If the :attr:`acknowledged` attribute is ``False`` all other
attibutes of this class will raise
:class:`~pymongo.errors.InvalidOperation` when accessed. Values for
other attributes cannot be determined if the write operation was
unacknowledged.
.. seealso::
:class:`~pymongo.write_concern.WriteConcern`'

@property
def acknowledged(self):

    return self.__acknowledged
