{"id":3616,"date":"2021-01-19T21:01:31","date_gmt":"2021-01-19T21:01:31","guid":{"rendered":"https:\/\/linuxways.net\/?p=3616"},"modified":"2021-01-20T08:43:51","modified_gmt":"2021-01-20T08:43:51","slug":"how-to-install-flask-on-ubuntu-20-04","status":"publish","type":"post","link":"https:\/\/linuxways.net\/de\/ubuntu\/how-to-install-flask-on-ubuntu-20-04\/","title":{"rendered":"How to Install Flask on Ubuntu 20.04"},"content":{"rendered":"

Introduction<\/h2>\n

Flask is one of the most well-known web frameworks used by many developers in the world. It is written in Python and designed to help developers build secure and scalable web applications.<\/p>\n

Flask is known as a micro-framework because it doesn\u2019t require any particular third-party libraries and tools. However, Flask can support extensions that are implemented in Flask itself to add features into a Flask application.<\/p>\n

This article will show you the way to install the Flask framework on your Ubuntu 20.04 machine.<\/p>\n

Installing Flask<\/h2>\n

In order to install Flask on Ubuntu 20.04, let\u2019s update the system first with the following command:<\/p>\n

$ sudo apt update<\/pre>\n
Once the update is complete, go ahead to the next steps.<\/p>\n
By default, Ubuntu 20.04 comes with Python 3.8. You can verify this by the following command:<\/p>\n
$ python3 -V<\/pre>\n
Next, you have to install python3-venv package to create a virtual environment for the Flask application:<\/p>\n
$ sudo apt install python3-venv<\/pre>\n
After the package is installed, let\u2019s create a virtual environment for the Flask application.<\/p>\n
It is recommended to create a new directory for the application and navigate into it:<\/p>\n
$ mkdir flask-dir && cd flask-dir<\/pre>\n
Now, let\u2019s run the following command in flask-dir to create the virtual environment:<\/p>\n
$ python3 -m venv venv<\/pre>\n
The command creates a directory named venv in flask-dir directory. In order use the virtual environment, you have to activate it as follows:<\/p>\n
$ source venv\/bin\/activate<\/pre>\n
<\/p>\n
Once the virtual environment is activated, you can install Flask using the Python package manager pip:<\/p>\n
(venv) $ pip install Flask<\/pre>\n
<\/p>\n
Verify that the Flask is successfully installed by running the following command:<\/p>\n
(venv) $ python -m flask --version<\/pre>\n
<\/p>\n
Congratulations, now you can create some Flask applications on your Ubuntu 20.04.<\/p>\n
Creating a simple application<\/h2>\n
In this section, we will create a simple \u201cHello world\u201d application with Flask. Using your favorite editor to create a Python file named as: hello.py in flash-dir:<\/p>\n
from<\/strong> flask<\/strong> import<\/strong> Flask\n\napp = Flask(__name__)\n\n@app.route<\/strong>('\/')\n\ndef<\/strong> hello_world():\n\nreturn<\/strong> 'Hello world'<\/pre>\n
In your virtual environment, run the following commands:<\/p>\n
(venv) $ export FLASK_APP=hello.py<\/pre>\n
(venv) $ flask run<\/pre>\n
<\/p>\n
Using your web browser or curl command to hit http:\/\/127.0.0.1:5000<\/a>, you will get the \u201cHello world\u201d text output as shown in the below screenshot.<\/p>\n
\"Flask<\/p>\n
Conclusion<\/h2>\n
Flask is a really powerful web framework for any developer. This tutorial went through all the detailed steps of installing Flask on Ubuntu 20.04.<\/p>\n
Thank you and feel free to feedback in the below comment section.<\/p>","protected":false},"excerpt":{"rendered":"
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