hello, I am trying to work through an issue with using

dataclass

when I'm running a workflow, and I need some help. I get this error when the tasks/workflow are being compiled:

TypeError: Invalid base type typing.Union in call to isinstance

. This workflow ran fine, until I started using a

dataclass

that I defined. To figure out the problem, I decided to use the

dataclass.py

example from here. I'm running everything locally (ideally without the Flyte demo cluster) to keep things as simple as possible. I noticed that if I run the example with

pyflyte run dataclass.py dataclass_wf --x 10 --y 20

, the workflow runs fine and outputs the result. OTOH, if I run it with

python dataclass.py

(which I assume should work because of the

if ___name___ == "main"

directive at the bottom of

dataclass.py

, I get a large number of errors that seem to either be

TypeError: Invalid base type typing.Union in call to isinstance

or

TypeError: isinstance() arg 2 must be a type, a tuple of types, or a union

. For context: the reason I'm trying to run my Flyte workflow via the main method is because I'm using hydra and I could not figure out another way to make sure that the Hydra configs are loaded and made available to the program. I want able to write my workflow so it worked with Omegaconf, but ran into this issue when I introduced dataclasses. so I am wondering: 1. Is it really only possible to run Flyte workflows via

pyflyte

? 2. Should I not expect things to work if I run a Flyte workflow through a file's main function? 3. How can I write my workflow so that I can use dataclasses and I can populate Hydra configs (or somewhat equivalently, run the workflow via the file's main function)?

hi, @polite-easter-71504, answers in order: 1. no, you should be able to invoke flyte's taks and workflows like regular python functions 2. answered above, i.e. this should work. 3. an OSS user recently developed https://pypi.org/project/flytekitplugins-omegaconf/. Can you give it a try? Can you give more details about the dataclass you're using?

hi eduardo, thanks for your response. I ended up finding a way around this issue by simply not using the dataclass. I don't quite remember the dataclass I was using at this point. I'm already using

flytekitplugins-omegaconf

though. If i run into further issues, I'll pipe up again here.

Alright, thank you.