how to use virtual environment python

py -m venv env

python3 -m venv env

source env/bin/activate

python3 -m pip install --user virtualenv

# First install virtualenv
!pip3 install virtualenv

# Go to the desired directory which you wish you run your virtual environment.
cd project_directory

# create a virtual environment called my_virtualenv
virtualenv my_virtualenv

### to run the virtual environemt run "activate" as in the following command
.\my_virtualenv\Scripts\activate

.\env\Scripts\activate