Install Python 3.6 on MacOS

Generally followed this post

I. Install brew
1. Install Xcode from the App Store
2. Install Xcode’s separate Command Line Tools app
$ xcode-select --install
3. Install and setup homebrew
$ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
4. Make sure brew is in PATH
$ vi ~/.bash_profile
export PATH=/usr/local/bin:$PATH
5. Source it
$ source ~/.bash_profile
6. Try brew
$ brew doctor
Your system is ready to brew.

II. Install Python
$ brew search python
$ brew install python3
$ python3 --version
Python 3.6.2
To install a python package
$ pip3 install package_name
To upgrade python
$ brew update
$ brew upgrade python3

III. Creating Virtual environments
$ mkdir sample_project
$ cd sample_project
$ python3.6 -m venv my_env
$ source my_env/bin/activate