This feels like something that has been answered elsewhere, but I seem to be missing something because I can't access upstream data in my Python expressions.

Quick example of what I'm trying to do: render with a ROPfetch, perform some comp operations in a ROPCompositeOutput node, change the output name via Python string manipulation in the copoutput channel, write to disk.

Here's some sample code running in that channel expression that I thought should get me the input file name or at least the upstream workItem, but no luck yet:


The results are all empty though:

Clearly I'm misunderstanding how to approach the problem because neither that example nor anything else I can think of from the Python reference gets me any data other than "None" or an empty array.

Thanks for any help.

Any ideas on how to do it. im facing the same roadblock right now. searching for solutions.

This helped me to access the output files of the upstream network. hope that might help someone.

And to get other attribute this is working well for me