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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 get_elapsed_time(self):
 """Get the elapsed time of the current split. """

        if self._start_time is None or self._end_time is not None:
            # the stopwatch is paused
            return self._elapsed_time
        return self._elapsed_time + (datetime.datetime.now() - self._start_time)