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I was testing some old scripts to see if they still worked and I tried RPNCalculator.py. I don't remember where I got it or who wrote it but it is failing with an error of:

Attribute Error: 'MyButton' object has no attribute 'fixed_time_step'

I have no idea what this is or how to go about finding the cause. The script is 847 lines so I don't want to post it here and I was reluctant to create a gist with someone else's code but if someone is willing to look at it I will find a way to make it accessible.

The code is available here.
https://gist.github.com/PKHG/4245408.

Discussed here:
https://forum.omz-software.com/topic/57/scientific-calculator

A google search "RPNcalculator site:forum.omz-software.com" would lead you to the discussion site.

Since it uses the old scene module, converting this code to use the new scene module may not be a simple change

Thanks, not sure why I didn't see that when I searched the forum but thanks for finding it for me. I wish I knew enough about the Scene module to fix it but I don't think this is a good first project. Perhaps someone who understands the old and new Scene module wants to update this?