Denis Kotov writes:
From huge codebase experience with C++, it does not cause significantly better (1) Readabillity or (2) Maintainability on its own compared to C
But that's not what we're talking about. "Port CPython to C++" is a perennial suggestion that gets rejected fairly quickly, as the C++ stdlib equivalent structures and functions in CPython are efficient and well-tested. I don't know much about Rust but I know that some core modules have already been ported to Rust. Since core devs, with a specific reason (security, it's crypto stuff) to move away from C are involved in that effort I would guess that movint to Rust is far more likely than to C++.
The point of C++ standard support level is linking CPython to external codebases using C++, and at least for the standard CPython currently supports, the C++ ABI is specific to each compiler and version (for some compilers), right?