https://www.geeksforgeeks.org/what-is-the-python-global-interpreter-lock-gil/

University of Minnesota - Twin Cities

In Cpython, the global interpreter lock prevents multiple threads from executing python bytecode concurrently. This mechanism is implemented because it ensures that certain objects (such as a dictionary for example) cannot be concurrently accessed. There are some built-in and third-party libraries that release this lock in computationally expensive tasks like compression or hashing. 

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