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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(self, sid):
 """ Constructs a MediaContext :param sid: The unique string that identifies this resource :returns: twilio.rest.api.v2010.account.message.media.MediaContext :rtype: twilio.rest.api.v2010.account.message.media.MediaContext """

        return MediaContext(
            self._version,
            account_sid=self._solution['account_sid'],
            message_sid=self._solution['message_sid'],
            sid=sid,
        )