Hello, friends. Python application development is at a fairly high point of popularity. This extends to all kinds of applications both web and desktop. Speaking of the web, today we will show you how to install Flask on Ubuntu 20.04 which is a microframework for making web applications with Python.
Now I will give you a brief introduction
Flask is a microframework for web applications created in Python. The “micro” in microframework means Flask aims to keep the core simple but extensible.
So that’s why this framework becomes very popular for developers who want to have full control of what happens in their application and the process.
So, today we are going to install it without problems on Ubuntu 20.04
Before you start make sure that the whole system is up to date. To do this run in a terminal:
sudo apt update sudo apt upgrade
Now, install python along with its dependencies as well as the package needed to create a virtual environment. This way the installation will be more secure.
sudo apt install python3 python3-venv Reading package lists... Done Building dependency tree Reading state information... Done The following additional packages will be installed: python-pip-whl python3.8-venv The following NEW packages will be installed: python-pip-whl python3-venv python3.8-venv 0 upgraded, 3 newly installed, 0 to remove and 19 not upgraded. Need to get 1,812 kB of archives. After this operation, 2,350 kB of additional disk space will be used. Do you want to continue? [Y/n]
Now create a new folder where your Flask project will be located. You can name it whatever you want but I will choose
mkdir project cd project
Once in the folder, you need to create the virtual environment with the following command
python3 -m venv venv
Now, activate the virtual environment
You will see that the prompt changes and now proceed to install Flask using PIP
pip install Flask
After the process finishes you will be able to check the installed version with this command
python -m flask --version Python 3.8.10 Flask 2.0.1 Werkzeug 2.0.1
As I always say, if we don’t test the installation then we won’t know if the process is correct.
To do this, create a file with some code. I will call it
Now, add the following code
from flask import Flask app = Flask(__name__) @app.route('/') def hello_world(): return 'Hello World! welcome to osradar.com'
Save the changes and close the editor.
Now, export the
Now, if you are using Flask on a local computer, you can test it with the following command
flask run * Serving Flask app 'helloworld.py' (lazy loading) * Environment: production WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Debug mode: off * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
Now open your web browser, and go to
http://127.0.0.1 and you will see the following
In case you have installed Flask on a remote server you can specify a host
flask run -host=0.0.0.0
So, enjoy it. Flask is well installed.
Flask is a good framework that allows us to start web development in Python. This way you can use it in your projects. Now that you know how to install it in Ubuntu 20.04 without problems.