[Mac] Python 버전 변경 해주기

brew update

brew install python

brew info python

===> Caveats 부분을 찾는다

==> Caveats
Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python@3.9/libexec/bin

 

/usr/local/opt python@3.9/libexec/bin 이 부분을 아래와 같이 PATH 로 지정

export PATH=/usr/local/opt/python@3.9/libexec/bin:$PATH

python --version