[ajoseps]

I'm guessing because Python's concurrency relies on the Global Interpreter Lock. Although I think concurrent.futures might address that. Haven't worked with python concurrency libraries in a bit.

[weff_]

as I posted above:

I agree the GIL is a problem but it's only an issue for CPU-bound problems. Is there really an important amount of CPU-bound work that is written in a scripting language? If it's CPU-bound, wouldn't you want to use something lower level?

[zaphirplane]

There is machine learning, which usually calls into numpy or other c extensions With a lot of the data preparation done in python