Python Tutorial: VENV (Mac & Linux) - How to Use Virtual Environments with the Built-In venv Module

In this Python Programming Tutorial, we will be learning how to use virtual environments on the Mac and Linux operating systems with the built-in venv module. We will learn how to create them, activate them, remove them, and much more. Let's get started...

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#Python #venv

[Rocorama]

You've gotta show this guy the love as he always explains things in such simple terms and then gives you a little extra that you weren't expecting! Thank you sir for all the time you invest to give us great content!

[ruixue]

0:48 why virtual environment
to have a space where we can install packages specific to a certain project
0:57 example for updating from Django 1 to Django 2
1:22 each project should have its own packages separate from each other
1:34 demo: need *Python 3.3 or higher*
2:05 pip3 list
2:51 create a new virtual environment - 2:57 *python3 -m venv project_env* (project_env is the name of the project to be initialized)
3:42 activate the created virtual environment - 3:45 *source* project_env/bin/activate
5:34 if other wants to export the packages that are used 5:39 *requirement.txt*
5:56 *pip freeze*
6:25 in Linux: *pip freeze > requirements.txt*
6:55 deactivate the project
*7:43** normal practice of using venv*
8:24 use of the created requirements.txt
8:35 *pip install -r requirements.txt*
9:04 one thing to mention: *it is common to put virtual environment inside your project folder, but you don't want to put project files into your virtual environment*
9:29
10:01 you shouldn't commit your virtual environment to your source control
10:16 what should be committed in version control: your requirements.txt
10:38 how to create an environment with access to system-packages
11:29 --system-site-packages
12:08 the additional packages installed in this environment won't affect the system packages
12:35 pip list --local

[kipronoelijahkoech]

You are just too great. Nowadays I search YouTube with your name I be like "virtual environment in Python Corey Schafer" .

[rafaelalvesduarte]

Simple, direct and well explained.

Thanks man, this helped me!

[abraraltaflone]

I was so much confused about the environment thing earlier but after watching the video you made so easy for me to understand. You're great!

[Ben-kzkm]

These virtual environments are a really clever way to not run into problems when you have different projects with different requirements. I love it!

[joelprestonsmith]

I love how simple and straightforward this video is. Whenever I want to learn something new about Python, I first check to see if you've covered it.

[leedavies]

concise, clear and perfectly delivered. I will be using this a lot from now on.

[pavelow]

been to numerous pages, wikis, stackoverflows and only got confused snippets of virtual environments. Watched your video and my brain got opened and clarity shone inside... magnifico!

[xA]

The introduction to venv that I was seeking - concise yet complete.

[rudiklein]

You're a great teacher. All of your video's are clear and interesting. Especially for an advanced noob like me.

[alexandrostsagkaropoulos]

So simple, yet elegant and concise explanation of something I just now comprehended completely. Congrats Corey, you are a phenomenal teacher!

[sheesh_kebab]

This video explains everything...and then goes beyond! Loved it.

[loudencm]

Corey...thank you...I have just started the road to data science and one thing I have never had a good simple explain action if were basics of setting up environments without much hassle. I followed this like ABC. I understand what is happening, what to do, how to undo it and how to pass it on.

[souravkaranjai]

Thank you for such an amazing video, You seem to know exactly what your student has in mind and what problems he is trying to solve while watching your videos.

[AdeAderinto]

Simple and straight to the point. Thank you for this. Much appreciated.

[ichbrauchmehrkaffee]

thank you for clearling up, not only how it's done, but also how the convention is

[Ausare]

On all of your videos (that I've watched) you fill knowledge gaps perfectly.

[nicklansbury]

Thanks for the helpful explanation Corey.


For those folks (like me) using the fish shell, at around the 3:50 mark you'll need to enter *source py3env/bin/**activate.fish* in the terminal otherwise you'll most likely get an error like this:


project_env/bin/activate (line 74): Missing end to balance this if statement
if [ -n "${BASH:-}" -o -n "${ZSH_VERSION:-}" ] ; then
^
from sourcing file project_env/bin/activate
called on standard input


source: Error while reading file 'project_env/bin/activate'

[KolHaNDLuKex]

As someone coming to Python from another programming language, this was very helpful!