[concurrency] Inside the Python GIL

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    Jeremy> I'm not sure I understand how to distinguish between I/O bound
    Jeremy> threads and CPU bound threads.

I don't know that we can (people writing bits of Python which operate on
threads).  I suspect a useful distinction though is that an I/O bound thread
mostly gives up the CPU to wait on an I/O device, while a CPU bound thread
is mostly "evicted" from the CPU by the OS scheduler.  (Though I sort of
suspect you already understand this textbook definition.)  Is that what
you're referring to by "not sure I understand"?

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