How to Getting Started With Python 3.X Virtual Environments on Mac OS X 10.10 Yosemite Easy Guide

December 6, 2014 | By the+gnu+linux+evangelist.

Python 3 Virtualenv/Virtualenvwrapper macOS Quick Start

The Unix Tutorial shows you Step-by-Step How to Install and Getting-Started with Python 3.x/2.x Virtualenv and Virtualenvwrapper for macOS 10.10 Yosemite Unix/BSD.

A Virtualenv Environment, put simply, is an isolated working copy of Python which allows you to work on a specific project without worry of affecting other projects.

The Virtualenvwrapper include wrappers for creating and deleting virtual environments and otherwise managing your development workflow, making it easier to work on more than one project at a time without introducing conflicts in their dependencies.

Getting-Started Virtualenv/Virtualenvwrapper Python 3 on macOS 10.10 Yosemite - Featured

Open a Command Line Terminal Window
Applications > Utilities > Terminal
(Press “Enter” to Execute Commands)

In case first see: Terminal QuickStart Guide.
Getting-Started with Python 3 on macOS Yosemite

Python 3 Quick Start for macOS

Python 3 Quick Start macOS
Installing Virtualenv+Virtualenvwrapper Python 3.
```
sudo pip3 install virtualenvwrapper
```

Initial Virtualenv SetUp.

nano $HOME/.profile

Append:

export WORKON_HOME=~/Envs/nexport VIRTUALENVWRAPPER_PYTHON=/usr/local/homebrew/bin/python3

Ctrl+x to Save & Exit from ‘nano’ Editor :)

source $HOME/.profile

source /usr/local/homebrew/bin/virtualenvwrapper.sh

Then you Dispose of 2 Virtualenv Versions: ‘virtualenv’ for Python 3.x and ‘virtualenv-2.x’ for Python 2.x :)
To Show Up:

ls -l /usr/local/homebrew/bin | grep virtualenv

To Make a Python Virtual Environmnet.
```
mkvirtualenv test
```
To List All the Existing Virtual Environments.
```
ls $WORKON_HOME
```
To Switch the Virtual Environmnet.
```
mkvirtualenv essai
```
```
workon test
```
Show the Working Virtual Env:
```
echo $VIRTUAL_ENV
```
To Install Software into the Virtual Environmnet.

For Example:
```
pip3 install django
```
To List All the Virtual Environmnet Packages.
```
lssitepackages
```
To Automatically Run a Command after Environment Creation.
```
echo '[sh-command]' > $WORKON_HOME/postactivate
```
For Instance to Automatically Change to the New Env Directory:
```
echo 'cd $VIRTUAL_ENV' > $WORKON_HOME/postactivate
```

To Automatically Installing Commonly Used Tools.

echo 'pip3 install [myGoodTool]' > $WORKON_HOME/postmkvirtualenv

For Example:

echo 'pip3 install sphinx' > $WORKON_HOME/postmkvirtualenv