[Python] What are the libraries or modules that extend the language they're in the most...

What are the libraries or modules that extend the language they're in the most

I'm thinking cross-language ( like a C script used by python) I know how to make equivalents across a few languages just not relying on libraries or modules.

I know ANSI C has 24 headers (corrected) for example. What libraries modules or headers extend a language to do things it was never designed for beyond builtins.

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