Installing Flask on Ubuntu 20.04

Flask is a popular Python web framework that allows you to quickly build web applications. Here are the steps to install Flask on Ubuntu 20.04:

sudo apt update

sudo apt install python3-pip

pip3 install flask

1. Open a terminal window.
2. Update the package index:
3. Install pip, a package manager for Python:
4. Install Flask using pip:

Once Flask is installed, you can start building your web application by creating a Python file and importing the Flask module. Here's a simple example:

from flask import Flask

app = Flask(__name__)

@app.route('/')
def hello():
    return "Hello, World!"

if __name__ == '__main__':
    app.run()

In this example, we create a Flask application, define a route "/", and a function to handle that route. When the "/" route is accessed, it will return the string "Hello, World!".

To run the Flask application, save the Python file with a .py extension (e.g., app.py) and execute the following command in the terminal:

python3 app.py

Your Flask application should now be running on http://localhost:5000. You can access it in your web browser to see the "Hello, World!" message.

That's it! You have successfully installed Flask on Ubuntu 20.04 and created a simple Flask application. You can now start building more complex web applications using Flask's features and extensions.