def asset_versions(self):
        """
        Access the asset_versions

        :returns: twilio.rest.serverless.v1.service.asset.asset_version.AssetVersionList
        :rtype: twilio.rest.serverless.v1.service.asset.asset_version.AssetVersionList
        """
        if self._asset_versions is None:
            self._asset_versions = AssetVersionList(
                self._version,
                service_sid=self._solution['service_sid'],
                asset_sid=self._solution['sid'],
            )
        return self._asset_versions
Access the asset_versions

        :returns: twilio.rest.serverless.v1.service.asset.asset_version.AssetVersionList
        :rtype: twilio.rest.serverless.v1.service.asset.asset_version.AssetVersionList