'freeze_notify() -> None
This method freezes all the "notify::" signals (which are emitted
when any property is changed) until the :meth:`thaw_notify` method
is called.
It recommended to use the *with* statement when calling
:meth:`freeze_notify`, that way it is ensured that
:meth:`thaw_notify` is called implicitly at the end of the block::
with an_object.freeze_notify():
# Do your work here'

def freeze_notify(self):

    raise NotImplementedError
