upgrade mac python version code example
Example 1: mac upgrade python to 3.8
brew install python3
brew update && brew upgrade python
alias python=/usr/local/bin/python3
Example 2: how to change mac default python version
$ echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n eval "$(pyenv init -)"\nfi' >> ~/.zshrc