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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def evt_toggle_pause(self, *args):
 # pylint: disable=unused-argument """Pauses and resumes the video source."""

        if self.event_source._timer is None:  # noqa: e501 pylint: disable=protected-access
            self.event_source.start()
        else:
            self.event_source.stop()