Not much in the Python language is categorically worse than features within JS when it comes to JIT creation.
My thesis work was on AOT JS compilation, in it I refer to a bunch of experimental Python runtimes, Self,etc and the main issues in all these papers were basically the of same kind.
Heck, even PyPy exists and iirc when it comes to the core language is almost entirely compatible (except for code that relies on ref-counting semantics but that code should apparently big fixed anyhow).
The real summary is:
CPython is a turd in many ways, the old C api holds it back and the community hasn't put the effort into using cross-implementation compatible C-bindings instead making PyPy or others a second class citizen.
My thesis work was on AOT JS compilation, in it I refer to a bunch of experimental Python runtimes, Self,etc and the main issues in all these papers were basically the of same kind.
Heck, even PyPy exists and iirc when it comes to the core language is almost entirely compatible (except for code that relies on ref-counting semantics but that code should apparently big fixed anyhow).
https://www.pypy.org/compat.html
The real summary is: CPython is a turd in many ways, the old C api holds it back and the community hasn't put the effort into using cross-implementation compatible C-bindings instead making PyPy or others a second class citizen.