They’re not running Rust they’re running machine code compiled with the Rust compiler. Like many other Python libraries such as numpy are running machine code compiled with C++, C or Fortran. That was always the case for Python and is its main selling point, it’s a slow but easy to write glue language that can make faster native code scriptable.

Also the article reeks of AI slop, it’s just trying to sell you a Rust course.

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vlovich123 6 hours ago | parent [-]

One main difference is that pyo3 is safer and easier to use to build said modules and have them work correctly without issues. Thus modules which hadn’t been worth it before to build in this manner suddenly become so

	▲	throwaway63467 6 hours ago \| parent [-]
		There’s a whole legacy of wrapper interface generators like SWIG that are way more powerful than PyO3, QT is e.g. fully mapped to Python using a very powerful wrapper generator (SIP). PyO3 is just a really simple interface generator in comparison, look at what SWIG can do, or SIP, what PyO3 does is trivial in comparison.