Mat should be of type openmc.Material or str?

[hhhnain]

I’m trying to run pincell depletion but getting errors when trying to print some results out.

i’m following the pincell tutorial from the documentation in Pincell Depletion — OpenMC Documentation

[lorenzoloi]

You are giving mat_id = 1 (intended as number), while the code needs it as a string (with quotes).
Try with:

_time, u5 = results.get_atoms("1", "U235")