def create_snapshot(self):
      client_token = generate_client_token()

      #设置快照名称
      snapshot_name = 'your-snapshot-name' + client_token

      #用于创建快照的磁盘ID
      volumeId = 'your-choose-volume-id'
      self.assertEqual(
            type(self.client.create_snapshot(volume_id,
                                             snapshot_name,

                                             client_token=client_token)), 
            baidubce.bce_response.BceResponse)

def list_snapshots(self): 

      #查询某一磁盘下的快照输入磁盘ID

      #若要查询系统盘，则输入实例ID
      volume_id = 'your-volume-id'

      #批量获取列表的查询的起始位置 
      marker = 'your-marker'

      #每页包含的最大数量
      max_keys = 100
      self.assertEqual(
            type(self.client.list_snapshots(marker=marker,
                                            max_keys=max_keys,
                                            volume_id=volume_id)), 
            baidubce.bce_response.BceResponse)

def get_snapshots(self): 

      #待查询快照ID
      snapshot_id = 'your-snapshot-id'
      self.assertEqual(
            type(self.client.get_snapshots(snapshot_id=snapshot_id)), 
            baidubce.bce_response.BceResponse)

def delete_snapshots(self): 

      #待删除快照ID
      snapshot_id = 'your-snapshot-id'
      self.assertEqual(                type(self.client.delete_snapshots(snapshot_id=snapshot_id)), 
            baidubce.bce_response.BceResponse)