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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 _createGaVariant(self):
 """ Convenience method to set the common fields in a GA Variant object from this variant set. """

        ret = protocol.Variant()
        if self._creationTime:
            ret.created = self._creationTime
        if self._updatedTime:
            ret.updated = self._updatedTime
        ret.variant_set_id = self.getId()
        return ret