python2 update puthon3 macos code example
Example 1: upgrade python version mc
brew install python3
brew update && brew upgrade python
alias python=/usr/local/bin/python3Example 2: set python3 as default mac
# it is said not to do but I used it anyway, because of the conveniency
$ echo "alias python=/usr/local/bin/python3.7" >> ~/.zshrc