How to Install Flask on Ubuntu 22.04 using Terminal

Flask is a micro web framework written in Python. It is classified as a microframework because it does not require particular tools or libraries. It has no database abstraction layer, form validation, or any other components where pre-existing third-party libraries provide common functions

In this tutorial, i am going to show you how to create a Python virtual environment and install Flask on Ubuntu 22.04 system.

How to Install Python Flask on Ubuntu 22.04 using Terminal

Use the below given steps and how to create a Python virtual environment and install Flask on your Ubuntu 22.04 machine:

Step 1 – Open Terminal OR Command Prompt

First of all, your terminal or command prompt by pressing Ctrl+Alt+T key:

Step 2 – Update APT Package

Now, run the following command on terminal to update Apt package list:

 sudo apt-get update

Step 3 – Verify Python Installed In Your System

Run the following command to verify that Python is installed on your ubuntu 22.04 system:

python3 -V

Output will be:

Python 3.9.0

Step 4 – Installing Flask

Run the following commands on your terminal to install flask.

The recommended way to create a virtual environment is by using the venv module, which is provided by the python3-venv package. So, execute the following command to install the package:

sudo apt install python3-venv

After that, Create a new directory for the Flask application and switch into it. So open your terminal and run the following command to create directory, which name flask_app:

mkdir flask_app && cd flask_app

Then run the following command inside the directory to create the virtual environment:

python3 -m venv venv

The command will create a directory called venv, which contains a copy of the Python binary, the Pip package manager , the standard Python library, and other supporting files. You can use any name you want for the virtual environment.

Step 4 – Activate Script

Run the following command to activate the activate script:

source venv/bin/activate

Once activated, the virtual environment’s bin directory will be added at the beginning of the $PATH variable. Your shell’s prompt will also change and show the name of the virtual environment you’re currently using. In this example that is venv.

Now that the virtual environment is activated, use the Python package manager pip to install Flask:

pip install Flask

To verify the installation, run the following command, which prints the Flask version:

python -m flask --version

Conclusion

In this tutorial, i have shown to you how to create a Python virtual environment and install Flask on your Ubuntu 20.04/22.04 machine.

That’s it. Python Flask has been download on your Ubuntu system.

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