How can I improve the Arithmetic Formatter challange

I have just completed the Arithmetic Formatter challenge in Python. How did I do please and what can I improve on? Always looking to better my work

There’s couple places that can be looked at, however I’d start with self-reflecting.

Go through the code and try to consider how satisfied are you with it. Is there something that was especially easy or hard? Which part do you find hard to understand? Is there something that could be written simpler? What do you think could be improved?