Problem with "Arithmetic Formatter" from Scientific Computing with Python

EDIT: already solved!

Hi, i made the program from scratch, it runs OK with all conditions given, but the autotests throw that it’s everything wrong.
any thoughts ?

Here is my code, run without autotest and check how it works
boilerplate-arithmetic-formatter - Replit

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Challenge: Arithmetic Formatter

Link to the challenge:

You’re using global variables. This essentially means that your functions can only run once, so whenever you try to use your code more than once, it will fail.

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Also, you need to return strings, not print them.

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do you think a simple solutions is to reset them after every use? or do i need to get rid of them?

You should remove the global variables. Variable scope should be as small as possible, as a general rule.

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