why would you use a virtual environment in python code example

Example 1: how to activate virtual environment in python

# for windows 10

py -m venv myvirtualenv
myvirtualenv\Scripts\activate #!!!! use "\" not "/" !!!!!

Example 2: creating virtual environment python

python3 -m venv tutorial-env
#name : tutorial-env
tutorial-env\Scripts\activate 	#activate env
deactivate #deactivate env

Example 3: making a virtual environment python

# 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

Example 4: virtual env in python

python3 -m venv tutorial-env