Now we will see how to install the virtual environment and how to activate it. 

To install the virtual environment on Linux, perform the following steps:

1. First check whether pip is installed or not. We are going to install pip for python3: 

sudo apt install python3-pip

2. Install the virtual environment using pip3:

sudo pip3 install virtualenv

3. Now we will create the virtual environment. You can give it any name; I have called it pythonenv:

virtualenv pythonenv

4. Activate your virtual environment:

source venv/bin/activate

5. After your work is done, you can deactivate virtualenv by using following command:

deactivate

In Windows, run the pip install virtualenv command to install the virtual environment. The steps for installing virtualenv are same as with Linux.