Lost in this Python world

Tell us what’s happening:
Hi guys.
I’m doing the: Scientific Computing with Python Projects - Arithmetic Formatter.

Your code so far
I’m done, I think. But I get 2 fails all the time. It was 4 before, but have have made some adjustments, but I’m still in trouble.

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36.

Challenge: Arithmetic Formatter

Link to the challenge:

Take a closer look at the tests output, looks like issues are just some typos in returned messages.