A quick HowTo.
venvis a package shipped with Python 3, which you can run using
python3 -m venv(although for some reason some distros separate it out into a separate distro package, such as
python3-venvon Ubuntu/Debian). It serves the same purpose as
virtualenv, but only has a subset of its features (see a comparison here). — source
I use it mainly for two reasons:
- it isolates the project-related libraries.
- it doesn’t access the globally installed libraries.
We can think of it as if the project would live on its own island, isolated from the rest of the world, having its own little things going on 🌴
Before we move on, let’s create some aliases for convenience of use.
If you type
which python in terminal, it will print out the path for the python executable, which should be something like this /usr/local/bin/python3.
Then, open ~/.bashprofile you can type
cat ~/.bashprofile to open it directly in terminal or use any other way suitable for you. And add there the following line:
Basically, we created an alias python for python3, and what it will do is each time you will be using python command it will be referring to python3, which I find neat. And, of course, you can skip this step if you want to.
Creating a virtual environment
Creation of virtual environments is done by executing the command venv:
In my case, I already had some script saved in folder in Desktop, so I wanted to sort wrap it in the venv.
➜ script git:(master) python -m venv /Users/user/Desktop/script
Activating the virtual environment
To activate virtual environment type the following command:
➜ script git:(master) ✗ source /Users/user/Desktop/script/bin/activate
And let’s say we have a requirements.txt file, which specifies all the dependencies required to successfully running the python project, now all those dependencies/libraries will be installed and accessible only within this virtual environment.
If you exit the terminal, next time you want to run your project you will need to
source ~/.bashprofile AND re-enable the virtual environment (using activate command from above).
That’s all Fellas! ☕️