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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_package_items(self):
 """Following Method gets all the item ids related to VS. Deprecated in favor of _get_upgrade_prices() """

        warnings.warn("use _get_upgrade_prices() instead",
                      DeprecationWarning)
        mask = [
            'description',
            'capacity',
            'units',
            'prices[id,locationGroupId,categories[name,id,categoryCode]]'
        ]
        mask = "mask[%s]" % ','.join(mask)

        package_keyname = "CLOUD_SERVER"
        package = self.ordering_manager.get_package_by_key(package_keyname)

        package_service = self.client['Product_Package']
        return package_service.getItems(id=package['id'], mask=mask)