how to setup virtualenv in python code example

Example 1: install virtualenv

pip install virtualenv

activate it by doing this:
cd myproject/Scripts/activate

Example 2: create a virtualenv python

pip install virtualenv
cd projectfolder #go to project folder
virtualenv projectname #create the folder projectname 
source projectname/bin/activate

Example 3: how to create a new virtualenv

to make a new virtualenv: 
virtualenv env_name

             to activate this virtual environment:
source env_name/bin/activate (on mac and linux)
source env_name/Scripts/activate (on windows)

Example 4: how to make virtual environment

virtualenv mypython