Maya python version question

[jiajun.coding]

If I am using Maya 2024 which contains python310.dll, I should make sure my Maya python toolkit scripts and modules upgrade to python 3.10?

Can I make Maya 2024 use another python version. For example, I can install python 3.9 and make Maya 2024 to use Python 3.9 instead of loading Python 3.10?

[count.temp20]

Why python 3.9 though? Are you using a specific tool that requires python 3.9?!

[jiajun.coding]

Yes. Need to integrate a specific toolkit still in python 3.9. I am evaluating the efforts between upgrade toolkit or other solutions.

[count.temp20 · Accepted solution]

Right. Well, I'm not really sure about that. I did a brief search on google and apparently there might be a way to do it. You simply have to change the PYTHONPATH variable to point to the specific version you are looking for. However, the thread is quit old. You might find it useful though:
https://stackoverflow.com/questions/20370100/changing-python-version-in-maya

I'll test it myself and let you know. In the meantime, take a look inside the toolkit you're using. I've had a somewhat similar experience trying to run a toolkit that was written for an older version of python (the opposite of what you were trying to do). Through some trial and error and investigating the exceptions raised, I managed to edit the source code and have the script run inside Maya. So I suggest you give that a try as well. Let me know how it goes. 

[jiajun.coding]

Finally, I edit the toolkit source code to run in higher python version. Change python version in maya will cause Maya crash due to some dll loading failures.

[jiajun.coding]

Right. Want to save efforts on maintain a python 3.9 written tools with hundreds of python scripts. Finally, I upgraded toolkit python scripts to higher version.

Thanks for your help!