Flask is a popular microweb framework written in Python. It is lightweight and easy to use, making it a good choice for developing small web applications. It is designed to enable developers to create and scale web apps quickly and easily. It has a small and easy-to-extend core, with sensible defaults to get started quickly.
In this article, we will show you how to install and use Flask on a Fedora system.
Prerequisites
Before you start, make sure that you have the following installed on your system:
- Python 3: Flask is a Python web framework, so you will need to have Python installed on your system. You can check if you have Python installed by running the following command:
python3 -VIf Python is not installed, you can install it by running the following command:
sudo dnf install python3 - Pip: pip is the package manager for Python. It is used to install Python packages, such as Flask. You can check if you have pip installed by running the following command:
pip3 -VIf pip is not installed, you can install it by running the following command:
sudo dnf install python3-pip
Installing Flask on Fedora
Once you have Python and pip installed, you can use pip to install Flask. To install Flask, run the following command:
pip3 install Flask
This will install Flask and all of its dependencies.
Creating a Flask App
Now that you have Flask installed, you can create a simple Flask app. Create a file called app.py and add the following code:
1 2 3 4 5 6 7 8 9 10 | from flask import Flask app = Flask(__name__) @app.route('/') def hello(): return 'Hello, World!' if __name__ == '__main__': app.run() |
This code creates a simple Flask app that displays a message when you visit the root URL.
Run Your Flask Application
To run the Flask app, open a terminal and navigate to the directory where you saved app.py. Then, run the following command:
python3 app.py
This will start the Flask development server, and you should see the following output:
Output* Serving Flask app 'app' * Debug mode: off WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Running on http://127.0.0.1:5000 Press CTRL+C to quit
To view the app, open a web browser and go to the URL http://127.0.0.1:5000/. You should see the message “Hello, World!” displayed on the page.
Conclusion
In this article, we showed you how to install and use Flask on a Fedora system. Flask is a lightweight and easy-to-use web framework that is perfect for developing small web applications. With Flask, you can create powerful and dynamic web applications with minimal effort.