I am working on Arithmetic Formatter project in python on replit.com but it is returning an error ModuleNotFoundError: No module named 'py test

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.66 Safari/537.36 Edg/103.0.1264.44

Challenge: Arithmetic Formatter

Link to the challenge: