Hi is there a `Serializer` that serializes `str`

Question

Luke Orland · Answer

I e `str` is the input type for ` serialize` and the output type of ` deserialize`

Luke Orland · Answer

specifically I m trying to write text as a file on S3 ` task result=S3Result bucket= location= serializer=StringSerializer `

Chris White · Answer

Hi < Luke Orland> I believe the `JSONSerializer` will do what you re looking for

Luke Orland · Answer

Thanks Chris My use case here is checkpointing the output of a `prefect tasks jupyter ExecuteNotebook` task which is a JSON string To store that as an ` ipynb` file I was converting that json to a dict so that the `JSONSerializer` would dump it back to JSON string My approach that seems to be working is to subclass `Serializer` with these implementations

Luke Orland · Answer

snippet py

Luke Orland · Answer

and then the str output of the ExecuteNotebook can be written out as a ` ipynb` file without the json gt dict gt json round trip

Chris White · Answer

Oh I understand your use case nice Your serializer definitely makes sense I see two ways we might include this back into the library include your `StringSerializer` implementation into the serializer library change the return type of `ExecuteNotebook` to be an actual dictionary instead of a JSON string this way the `JSONSerializer` works out of the box I would prefer the latter although I m not sure if there was a reason for the JSON string return type whichever way we go it would be interesting to allow for specifying serializers at the task level so that we could default to these serializers for this task so other users don t have to worry about it

Luke Orland · Answer

Yeah that s a nice idea

Chris White · Answer

I ll open an issue for us < Marvin> open Change return type of ExecuteNotebook and allow tasks to specify default result serializers

Marvin · Answer

Luke Orland · Answer

For the ExecuteNotebook task there are 2 `output format` options JSON and HTML The JSON output if written to a ` ipynb` file can be read as a notebook file by Jupyter For HTML output that ` html` file can be rendered by a web browser Either way the output is `str` and should be serialized by something like a `StringSerializer` `dict` output from that task wouldn t really work if HTML is the selected `output format`