map python3 to python mac code example
Example 1: how to set default python version in macos
ln -s -f /usr/local/bin/python3.7 /usr/local/bin/python
Example 2: transition from python 2 to 3 terminal
alias python="python3"
ln -s -f /usr/local/bin/python3.7 /usr/local/bin/python
alias python="python3"