What is a Virtual Environment in Python?

Published: 26 March 2022
on channel: Sam Westby Tech

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In this video you will learn all about virtual environments in Python. I include commands for Mac, Windows, and Linux. I also cover venv verses virtualenv.
Why use them
What are they
How to use them
When to use them

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TIMESTAMPS and COMMANDS
0:00 Intro
0:14 Why use a virtual environment?
0:59 What is a virtual environment?

Check python version with python -V
Make a virtual environment: python -m venv env
If you have Python older than 3.3 run: python -m pip install virtualenv
then make the virtual environment: python -m virtualenv env
Look at your site packages: pip list

3:55 Activate your virtual environment
Windows: .\env\Scripts\activate
Mac/Linux: source env/bin/activate
You should see "(env)" at the start of your command line
Do "pip list" to verify your virtual environment is working

5:25 Transferring environments
Look at "pip freeze"
Run: pip freeze "GREATER THAN SYMBOL" requirements.txt
(sorry youtube doesn't let me do the greater than symbol in the description)
Make your new environment
Run: python -m pip install -r requirements.txt

7:55 virtualenv verses venv

8:20 Recap

I hope this helped!

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