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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 outgoing_caller_ids(self):
 """ Access the outgoing_caller_ids :returns: twilio.rest.api.v2010.account.outgoing_caller_id.OutgoingCallerIdList :rtype: twilio.rest.api.v2010.account.outgoing_caller_id.OutgoingCallerIdList """

        if self._outgoing_caller_ids is None:
            self._outgoing_caller_ids = OutgoingCallerIdList(self._version, account_sid=self._solution['sid'], )
        return self._outgoing_caller_ids