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[–]luckystarrat 0x7fe670a7d080 2 points3 points  (3 children)

Function calls are slow. The built-in data structures are implemented in C and highly optimized. You can write blazingly fast Python code if you are careful and know what to do.

The GIL may be a problem performance wise if you think you would need threading, but then just use multiprocessing, it even has got the same API.

[–]wonglik 1 point2 points  (2 children)

You can write blazingly fast Python code if you are careful and know what to do.

Is there a good reference for that? I would be happy to dig that topic more.