[Python] python3으로 업그레이드 (mac)

brew install python3

# 어쩌고 저쩌고 에러 나면
sudo mkdir /usr/local/Frameworks
sudo chown -R $(whoami) /usr/local/Frameworks/
brew link python

# edit bash_profile
vi ~/.bash_profile
alias python='python3'

# reload
. ~/.bash_profile