Python 2

• macOS ships with Python already. But it is better not to mess with the system Python.
• Because some system tools rely on it.
• So we are going to install Python with Homebrew.

Installation

• To install Python, type these in Terminal::

  brew install python
  

Virtualenv

• Virtualenv is a tool to create isolated Python environments.
• It is better to install Python packages in the project folder instead of installing them globally.
• The advantage is that different projects may need different versions of packages.
• To install Virtualenv, type:

  pip install virtualenv
  

Python 3

Installation

• To install Python3, type these in Terminal::

  brew install python3
  

Virtualenv

• Use pyvenv instead of Virtualenv
• No extra installation is necessary as it comes with the installation of Python 3