1. Install Homebrew, you can see my previous blog, link: HomeBrew installation
2. After Homebrew is installed, install Python3
Search first:
$ brew search python3 output: app-engine-python micropython python3 boost-python python wxpython gst-python python-markdown zpython Caskroom/cask/awips-python Caskroom/cask/mysql-connector-python Caskroom/cask/kk7ds-python-runtime
Install Python3, wait...
$ brew install python3
After the installation is complete, the specific path is: /usr/local/Cellar/python3/3.6.0, you can go to it in finder,
You can link the software to LaunchPad with the following commands. The software can then be launched in LaunchPad.
$ brew linkapps python3