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(virtualenv-heading)=
# Virtualenv
## Why Use Virtualenv?
You should use [Virtualenv](https://virtualenv.pypa.io/en/latest/) because:
- It allows you to install multiple versions of the same dependency.
- If you have an operating system version of Python, it prevents you from changing its dependencies and potentially
messing up your os.
## How to Use Virtualenv
Create your project folder, then a virtualenv within it:
```console
$ mkdir myproject
$ cd myproject
$ python3 -m venv .venv
```
Now, whenever you want to work on a project, you only have to activate the corresponding environment.
```{eval-rst}
.. tabs::
.. group-tab:: OSX/Linux
.. code-block:: text
$ . .venv/bin/activate
(venv) $
.. group-tab:: Windows
.. code-block:: text
> .venv\scripts\activate
(venv) >
```
You are now using your virtualenv (notice how the prompt of your shell has changed to show the active environment).
To install packages in the virtual environment:
```console
$ pip install click
```
And if you want to stop using the virtualenv, use the following command:
```console
$ deactivate
```
After doing this, the prompt of your shell should be as familiar as before.
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