Python shared libraries

Question

As I understand it, in python (CPython) there are two types of modules: - extension .so (C) -.py

.so are loaded only once, even when there are different processes / interpreters importing them.

.py is loaded once for each process / interpreter (unless explicitly loaded).

Is there a way .py can be used by multiple processes / interpreters?

Someone will need another layer where you can save the changes made to the module. I think you can embed an interpreter in .so as a first step. Is there an already developed solution.

I admit that I can be very far in terms of possible ideas about this. Please excuse my ignorance.

Answer 1

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Answer 2

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Answer 3

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Python already has a third way to load modules. If possible, when you download the .py file, it creates a precompiled .pyc file that loads faster (you avoid compilation). Next time it will download the .pyc file. Perhaps they could have a .pyc file just paste it into memory. (Using MAP_PRIVATE in case other things get corrupted with this byte code later.) If they do, then common modules will be included in shared memory by default.

I do not know if this is really implemented in this way.