That is the wrong way to do it. Just install pyenv/pipenv to manage different Python versions. It's dead simple to maintain system Python, Python 2.7x, and Python3.7.3 that way.
You can do that anyway, `python` is always Python 2 (except on Arch where `python` is Python 3 and the Python 2 executable is `python2`) and the Python 3 executable is called `python3`. `pyenv` is more for keeping multiple minor versions of the same major version (e.g. Python 3.6 and Python 3.7) around at the same time.
Actually, it doesn't have to be multiple minor versions, it can be any version–major or minor. It can even be Iron Python or Jython. Anyway, the point is that it's smart not to touch system Python on macOS. So when I run:
`$ pyenv versions`
My output is:
`system
`2.7.16
`* 3.7.3 (set by /Users/wyclif/.pyenv/version)
Dead simple and easy to use. Much better than overwriting and reinstalling when you need a different version for a specific project.