Not sure why that wouldn't be working for you, it looked good to me, so did a test. I put this in the probe area of d3oi and it worked fine, inspect showed the class variable had been updated.
try:
import situations.situation
from sims4.tuning.tunable import TunableSimMinute
situations.situation.Situation.INSTANCE_TUNABLES['my_key'] = TunableSimMinute(description=None, default=0, minimum=0)
for k,v in inspect.getmembers(situations.situation.Situation):
output += ' {}={}\n'.format(k,v)
except:
output += "EXCEPTION: {}\n".format(traceback.format_exc())
Output, most of it snipped out to just the area around the relevant result...
Comments
Output, most of it snipped out to just the area around the relevant result...