macos install make default python3 code example
Example 1: use python3 as default mac
ln -s -f /usr/local/bin/python3.7 /usr/local/bin/python
Example 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