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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 data_labels(self):
 """ |DataLabels| instance providing properties and methods on the collection of data labels associated with this plot. """

        dLbls = self._element.dLbls
        if dLbls is None:
            raise ValueError(
                'plot has no data labels, set has_data_labels = True first'
            )
        return DataLabels(dLbls)