How to Create a Python virtual environment

install virtualenv

• First, it's better to check if virtualenv is already installed. this can be done by running the following command:

virtualenv --help

• If you encounter an error message like "command not found," it indicates that virtualenv is not installed and you need to install it. Otherwise, the usage and options are displayed.

• To install it, use the command:
  

pip install virtualenv

Create a Virtual Environment:

• To create a new virtual environment, simply execute:

virtualenv name_of_virtual_envirement

A directory of the name will be then created:

Activate the virtual environment

• to activate the virtual environment, navigate to the directory and execute the following:

source bin/activate

To deactivate it

• To exit the virtual environment, simply run:

deactivate

How does it work

• Once you're in the Python virtual environment any Python packages you install using pip are local to the environment, i.e.: They won't affect your global Python installation.

• To view the packages installed in your virtual environment, you can:

• First, install a package, for example:
  

pip install discord

• then:

pip freeze

• the name of the package, its dependencies, and respective versions should appear
• you can also save your environment packages in a requirement.txt file using the following command:

pip freeze > requirement.txt

• Later, if you want to install all the dependencies of your project in a single step, you can use:

pip install -r requirements.txt