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We will now create the backend for the to-do list. Open your web browser and go to You should see "Hello, World!" displayed on the page. Run the Flask app: $ export FLASK_APP=app.py $ flask run Next, create a virtual environment for your project and activate it: $ python3 -m venv venv $ source venv/bin/activateĬreate a new file called app.py in your project directory and add the following code to it: from flask import Flask app = Flask(_name_) def index(): return "Hello, World!" if _name_ = "_main_": app.run(debug=True) Step 3: Test the Flask app Open your terminal and create a new directory for your project: $ mkdir todo-app $ cd todo-app A text editor or integrated development environment (IDE) of your choice.You will need the following software installed on your computer: Step 1: Set up a development environmentīefore you start building your web app, you need to have a development environment set up. We will be using Flask, a popular Python web framework, to build the backend of the app and HTML, CSS, and JavaScript for the front end. This tutorial will guide you through the process of building a simple to-do list web application using Python.