DataFrame and multiprocessing in python

I had done a exercise in python and came across with the following problem:enter image description here

And this is my code: enter image description here

Someone can me help with this?

I used jupyter-notebook, pandas and multiprocessing in python.

I tried to change the number of wokers, but even though didn't work. I expected that the function populate the new_df with the informations that I requested.

source https://stackoverflow.com/questions/75250631/dataframe-and-multiprocessing-in-python

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