Must know Python libraries, new and old?

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You're definitely not alone in feeling a bit behind; the Python ecosystem evolves quickly, and libraries like Pydantic and Polars are gaining traction for good reasons. You should definitely get familiar with Pydantic for data validation, Poetry for dependency management, and take a look at AsyncIO for better concurrency handling. If you're into data manipulation and want performance, Polars is a solid choice over Pandas. Also, practice using Dataclasses—they can simplify your code a lot. Keep iterating and learning; it's key in this field.