In the previous installment, we dived into some of the low-level details and problems related to Python threads. As a brief recap, although Python threads are real system threads, there is a global interpreter lock (GIL) that restricts their execution to a single CPU core. Moreover, if your program performs any kind of CPU-intensive processing, the GIL can impose a severe degradation in the responsiveness of other threads that happen to be performing I/O.
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