How can I combine files into one CSV file?

If you can't describe a your data and your desired result clearly, there is no way that you will be able to code it--taking on a simple project is a good way to get started using a new language.

If I understand correctly your first file is your key order file, and the remaining files each contain a byte per key in the same order. You want a composite file of those keys with each of their data bytes listed together.

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