Why am I get a "def" in the result?

Hi, I had just finished the project “Sal’s Shipping” under the “Control Flow” section and generally everything looks ok except with a grey dark word “def” printing at the result which I am not knowing where it comes from? Could anybody please offer a help for me for this weird output?

Sal’s Shipping code

Hm, that’s odd.

Copy your code into a text editor and then reset the page/lesson and then paste your code back into the lesson to see if that resolves the issue.

After I close and open the page, the code run perfect! Thank you!

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