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    there is no value for '' in your dict1

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    Again, the tests are ok, think about how you give change when they pay you with a 100 dollars bill (there are two ways, you're using the wrong one when you can use the other).

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    Both tests are ok, you're giving back the change wrong.

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    NO NEED TO SCREAM LIKE THAT!...

    it's in your code, debug it by reading the full error message: it even tells you where the problem is and what it is.

    edit: oh, wait, seems I'm not awake enough. Lemme take a look.
    edit²: ok, I'm effectively not awake enough, but it is in your code.