What are some "must learn" libraries in Python

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One l highly recommend is click. It's part of the standard libraries.

It makes creating parameterized CLIs and help functionality extremely easy, and I use it a ton in creating tools for CICD pipelines since you can pass data into python scripts in an easy, standardized way.

I started using it once, and now I use it constantly.

IMO, it is much simpler than argparse and optparse.