unified python versions on Macbook M1

• set python3 to a designated version:

brew link python 3.X.X

• set python to python3, E.G:

sudo ln -s -f $(which python3) $(which python)

• Ref:

  • https://stackoverflow.com/questions/18425379/how-to-set-pythons-default-version-to-3-x-on-os-x