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Python Virtual Environments Cheat Sheet by

A virtual environment is a Python tool for dependency management and project isolation. They allow Python site packages (third party libraries) to be installed locally in an isolated directory for a particular project.

What is a virtual enviro­nment?

A virtual enviro­nment is a Python tool for dependency management and project isolation. They allow Python site packages (third party libraries) to be installed locally in an isolated directory for a particular project.

Most Popular Virtual Enviro­nment Manager

virtualenv
The most popular and work with Python 2 and 3
venv
A standard library, similar to virtualenv shipped with Python 3
virtualenvwrapper
A set of extensions to virtua­lenv. Useful when using multiple virtualenv direct­ories.
pipenv
Less popular, It automa­tically creates and manages a virtualenv for your projects by combining Pipfile, pip and virtualenv into one command on the comman­d-line.
poetry
Similar to pipenv
conda
Included in all versions of Anaconda and Miniconda. Anaconda brings many of the tools used in data science and machine learning with just one install.

Using virtualenv and venv

Installing virtualenv
macOS and Linux
python3 -m pip install --user virtua­lenv
 
Windows
py -m pip install --user virtua­lenv
Creating a virtual enviro­nment
macOS and Linux
python3 -m virtualenv my-env
 
Windows
py -m virtualenv my-env
Activating a virtual enviro­nment
macOS and Linux
source my-env­/bi­n/a­cti­vate
 
Windows
.\my-­env­\Sc­rip­ts­\act­ivate
Leaving the virtual enviro­nment
 
deact­ivate
Installing packages
 
pip install requests
To use venv instead of virtualenv simply change virtualenv with venv while creating the virtual enviro­nment

Using Pipenv

Installing Pipenv
macOS and Linux
python3 -m pip install --user pipenv
 
Windows
py -m pip install --user pipenv
Install packages from Pipfile
macOS and Linux
python3 -m pipenv install
 
Windows
py -m pipenv install
Add a package
macOS and Linux
python3 -m pipenv install requests
 
Windows
py -m pipenv install requests
Activating a virtual enviro­nment
macOS and Linux
python3 -m pipenv shell
 
Windows
py -m pipenv shell
Leaving the virtual enviro­nment
 
exit
When installing a package for the first time a virtual enviro­nment will be created automa­tically and it will create a Pipfile for you in your project’s directory. The Pipfile is used to track which depend­encies your project needs in case you need to re-install them.
                       

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