use virtualenv python code example

Example 1: python virtual environment

python3 -m venv env
python -m virtualenv env #py2

source env/bin/activate

#all this is on same directory

Example 2: how to use virtual environment python

python3 -m venv env

Example 3: how to make a venv python

python3 -m venv env
python -m virtualenv env #py2

source env/bin/activate

#all this is on same directory

Example 4: how to use virtual environment python

source env/bin/activate