Yes, they do. Python does. I'm sorry but your wires are getting crossed somewhere. You also completely ignored the comment you where replying to and the sources

Yes, they do. Python does. I'm sorry but your wires are getting crossed somewhere. You also completely ignored the comment you where replying to and the sources he cites for you and repeated essentially the same thing you said before. This is quite rude. Python has a GIL, so only one thread can interact with the Python interpreter at one time. You can have any number of threads running at one time if they release the GIL and don't touch the interpreter (i.e if they are doing IO or calling a C function). They, however, are still real OS threads, running (waiting for a lock) on separate cores and sharing process memory. That's the definition of a thread. They are not fake threads. They share memory. They run on separate cores (perhaps). I'm not sure what your last sentence means.