Python 3.12 Subinterpreters: A New Era of Concurrency

Python 3.12 introduces subinterpreters, a new feature that allows for concurrent execution in Python. Subinterpreters run Python code in parallel with the main interpreter, in the same process and address space, but with completely isolated execution resources. They can improve performance and concurrency in Python by bypassing the limitations of the Global Interpreter Lock (GIL). Subinterpreters can be used to create separate environments for improved security and isolation. The future of subinterpreters looks promising with the proposed introduction of a high-level API for managing subinterpreters in the Python standard library.