how to use a python virtual environment code example
Example 1: virtual env create python
sudo apt-get install python3.6-venv
python3 -m venv env
source env/bin/activate
py -m pip install --user virtualenv
py -m venv env
.\env\Scripts\activate
Example 2: python virtual environment
python3 -m venv env
python -m virtualenv env
source env/bin/activate
Example 3: activate venv
source env/bin/activate
Example 4: python virtual env
$ virtualenv --version
Example 5: python virtual env
$ virtualenv -p /usr/bin/python2.7 venv
Example 6: how to workon virtual environment in linux
<env name>\bin\activate