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It can’t be 3.8 or any later version and it can’t be 3.6 or any earlier version. This also assumes EA hasn’t haven't upgraded the python version the Sims 4 uses (which they sometimes do).
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In the future this could be out of date but just know that if it EA changes it in the future it has to be the exact version they change it to. You can find all the current latest python versions from here and as of this writing you need to download the latest 3.7 one. I have multiple python versions installed so I just download it to C:\Python37 and chose not to add it to the system path because I hate dealing with multiple versions on the system path. Normally I recommend for you to not to just blatantly copy me as this helps you to learn better instead of copying/pasting/replicating each step. However for Python, I do suggest installing it to C:\Python37 or any path that doesn’t have spaces in it. If you can’t download it to C:\Python37 you may can download it to C:\Users\Python37, C:\Users\YourName\Python37 (If you don’t have a space in your name), or C:\Users\Public\Python37. There’s a step we’re going to do below that won’t work if you have a space anywhere in the path.
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Remember when I said this angers me that EA says one thing and acts a different way to the modding community. In order to write python scripts for The Sims 4, you need to know how to interact with the game. To do that you need to know what code is available inside the game for you to work with.
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