brew install python3
brew install python3 brew update && brew upgrade python alias python=/usr/local/bin/python3
$ brew update && brew upgrade python
$ pyenv global 3.7.3 # and verify it worked $ pyenv version 3.7.3 (set by /Users/mbbroberg/.pyenv/version)
$ python --version Python 2.7.6 $ python3 --version Python 3.4.3 $ alias python=python3 $ python --version Python 3.4.3
$ brew install pyenv