virtualenv for 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: python install virtualenv

python3.8 -m pip install --user virtualenv
python3.8 -m virtualenv --help

Example 3: python venv

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

Example 4: python virtualenv

python -m venv my_env

Example 5: python virtualenv

python -m venv my_env
source my_env/bin/activate