Why the Hardest Concept for Python Devs Is Concurrency: asyncio vs threading vs multiprocessing
Concurrency is arguably the hardest concept for Python developers, because the important ideas already assume you understand the operating system underneath. In this chapter, we start from the kernel and system calls, build up processes, threads, race conditions, and the GIL, then work out when to reach for asyncio, threading, or multiprocessing, why a GPU beats a CPU on the same arithmetic, and how to get better at concurrent programming.