create virtualenv using python 3 code example

Example 1: create a virtualenv python

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

Example 2: create a virtual environment python 3

python3 -m venv /path/to/new/virtual/environment

Example 3: create a virtualenv python3

py -m venv env