Code project - Arithmetic arranger

So i have completed all the tasks and the error messages all work fine i just need some guidance as to why the string is not being excepted in the tests even though the string looks to me and displays as though it is correct

https://replit.com/@pYcotic/boilerplate-arithmetic-formatter#arithmetic_arranger.py

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Challenge: Arithmetic Formatter

Link to the challenge:

What do the errors say?


Looking at the error messages, I think you’re mixing up - and _

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I believe you are right thank you