The threading module utilizes strings, the multiprocessing module utilizes processes. The thing that matters is that strings run in a similar memory space, whereas processes have separate memory. This makes it cycle harder to impart objects between processes to multiprocessing. Since threads utilize a similar memory, precautions must be taken or two threads will keep in touch with a similar memory simultaneously. This is the thing that the global interpreter lock is for.
Spawning processes is a piece slower than spawning threads.
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