Threads inherit the process's interpreter (which is how they share the GIL). Contrast to multiprocessing, which spawns a new interpreter and communicates with i

Threads inherit the process's interpreter (which is how they share the GIL). Contrast to multiprocessing, which spawns a new interpreter and communicates with it via a python IPC, such as multiprocessing.Queue, which shares the interface with queue.Queue or the slightly clumsy multiprocessing.Value class: from multiprocessing import Process, Value def f(n): n.value = 3.1415927 num = Value('d', 0.0) p = Process(target=f, args=(num)) p.start() p.join() print num.value # 3.1415927