make python3 default mac code example

Example 1: use python3 as default mac

ln -s -f /usr/local/bin/python3.7 /usr/local/bin/python

Example 2: which python mac

$ brew update && brew upgrade python

Example 3: 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

Example 4: mac why is python installed in usr and application

$ pyenv global 3.7.3
# and verify it worked 
$ pyenv version
3.7.3 (set by /Users/mbbroberg/.pyenv/version)

Example 5: mac catallina python3

$ brew install pyenv

Example 6: use python as python3 zsh

# Go into your .zshrc file. Is there a line that reads:
alias python='python3'