How does Python’s Global Interpreter Lock (GIL) affect multithreading, and in what scenarios is multithreading still beneficial despite the GIL?

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Sigiloso · Accepted Answer

The GIL allows only one thread to execute Python bytecode at a time, limiting true parallelism for CPU-bound tasks. Multithreading is still useful for I/O-bound tasks like network calls or file I/O, where threads can wait without blocking the interpreter.

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