about add_watch_callback

[316953425]

Use the add_watch_callback function to listen key events. If the key is deleted, how to get the value before the key deleted in the callback function of add_watch_callback.
For example:
key：/hello value：1234
delete /hello
Using add_watch_callback how to get 1234 when delete event occurs

Looking forward to your answer, thank you very much

[itsparth]

You can pass prev_kv=True as a kwarg, see https://etcd.io/docs/v3.2/learning/api/#watch-streams
E.g. etcd.watch("/key", prev_kv=True)