The "Write a Python Hook..." Problem

I am retaking the machine learning course and will get stuck again writing a python hook. Anyone have suggestions as to where I should brush up on writing hooks with python?

What sort of hook are you referring to? I don’t recall where/if that is covered in the course materials.

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i believe it comes up in week three but I could be wrong. Perhaps what I am refering to is among the labs. Yes. I believe that’s it.