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by jacobsenscott 1957 days ago
This is just a misunderstanding of how brew works. Brew is doing what it is designed to do. Your assumptions are that brew should be able to "pin" a package to an exact version, or that it is selecting packages at random to upgrade, but those assumptions are wrong.

https://docs.brew.sh/FAQ#why-does-brew-upgrade-formula-also-...

However brew does support your use case, but it take some extra effort. If you want to use brew to install an exact version of python you need to create a tap: https://docs.brew.sh/How-to-Create-and-Maintain-a-Tap

Also, you aren't forced to use brew to install that version of python. You can do so yourself using the standard make; make install. It would be best to install it under /opt. Or use any other available method of installing software on your mac.