Scientific Computing with Python Projects - Budget App

Tell us what’s happening:
It seems that I can get the right solution when I separately test the function of my class, but when using the main() to do the overall test, it reports a lot of falses. It seems that there are some interference between different tests in test.py.

Your code so far
https://replit.com/@yjzhang1/boilerplate-budget-app-1#budget.py

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Challenge: Scientific Computing with Python Projects - Budget App

Link to the challenge:

Usually this means you are polluting the global space or using class variables instead of instance variables.

Thank you very much. Just learnt about class/instance variables and fixed the problem!

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