'Get each item, delete it, and shift to a new course export dir.'

def delete_item(self, block_list, revision):

    for (block_type, block_id) in block_list:
        with self.store.branch_setting(ModuleStoreEnum.Branch.draft_preferred):
            test_item = self.store.get_item(self.course.id.make_usage_key(block_type=block_type, block_id=block_id))
        self.store.delete_item(test_item.location, self.user_id, revision=revision)
    self.export_dir = self._make_new_export_dir_name()
