Method unregister

IPython/core/events.py:65–78

Remove a callback from the given event.

(self, event, function)

        self.callbacks[event].append(callback_proto.adapt(function))
    
    def unregister(self, event, function):
        """Remove a callback from the given event."""
        if function in self.callbacks[event]:
            return self.callbacks[event].remove(function)

        # Remove callback in case ``function`` was adapted by `backcall`.
        for callback in self.callbacks[event]:
            try:
                if callback.__wrapped__ is function:
                    return self.callbacks[event].remove(callback)
            except AttributeError:
                pass

        raise ValueError('Function {!r} is not registered as a {} callback'.format(function, event))

    def trigger(self, event, *args, **kwargs):
        """Call callbacks for ``event``.