Creating a Virtual Environment for Python

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Virtualenv is a tool that creates an isolated environment separate from other projects. In this instance we will be installing different Python versions, including their dependencies.

A simple steps to follow.
1. Install Virtualenv
apt-get update
apt-get install python-virtualenv

2. Create a Virtual Environment and Install Python 3
virtualenv -p /usr/bin/python3 virtualenvironment/project_folder

3. Activate your Virtual Environment
cd virtualenvironment/project_folder/bin
source activate

or if you are outside of the bin directory, you can use:
$ source virtualenviroment/project_folder/bin/activate

You’ll see that you are now in this newly made environment by the change of the shell prompt reflecting the name created.
(project_folder) root@host2:~#

To exit your virtual environment, simply type.
deactivate

Source:

Creating a Virtual Environment for Python on Ubuntu 16.04

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