The Flask Web Framework: A Beginner’s Guide

It’s designed to make getting started quick and easy, with the ability to scale up to complex applications. It provides you with tools, libraries, and technologies that allow you to build a web application. This web application could be a website, a web API, a web service, or a complex web-based application. FastAPI shines with its intuitive API documentation, automatic data validation, and robust editor support.

  • Flask’s lightweight structure, coupled with its rich ecosystem of extensions, ensures developers can build web applications that align precisely with their project requirements.
  • Alternatively, as a microframework, Flask can interact with other tools easily and flexibly, even the ones you didn’t plan on working with when you set out.
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  • On the right side of the screen, you’ll watch an instructor walk you through the project, step-by-step.
  • Real-time applications require a technology that can push server-side content to the client instantly as it happens.

The minimal nature of Flask and its aptitude for developing smaller web apps means that it’s even more flexible than Django itself. Essentially because it doesn’t rely Flask Framework for Python Developers Lessons on other tools or programming libraries in order to function. At just over 11 years old, Flask is roughly the same age as the more famous Python web framework, Django.

With these modifications in place, save and close the app.py file.

Jinja2 is a web template engine that combines a template with a certain data source to render dynamic web pages. In Easy Language, It combines a template (the layout of the page) with data (the specific information you want to show) to create a dynamic web page. Before we dive into the specifics of FastAPI and Flask, it’s essential to understand the pivotal role APIs play in today’s interconnected digital landscape.

Flask Framework for Python Developers Lessons

In this step, you’ll create your main Flask application in a new file. As part of this tutorial, you’ll use the Bootstrap toolkit to style your application so it is more visually appealing. When you use url_for(), Flask creates the full URL to the given view for you. This means that if you change the route in your Python code, then the URL in your templates updates automatically. Commonly, the Jinja base template is named base.html, and it contains the main HTML structure of your web pages. You start by declaring the doctype, wrapping everything in tags, and setting the lang attribute.

Creating Your First Flask App

This means that developers will have to manually add extensions such as libraries. And, if you add a huge number of extensions, it may start to slow down the app itself due to a multitude of requests. With some minimal styling, your Flask web project is starting to look like a finished web app. Once you’re finished, you can continue to work on the message board project by adding a database and accepting posts from your users.

  • You pass the value ‘/’ to @app.route() to signify that this function will respond to web requests for the URL /, which is the main URL.
  • The files and folders that you create over the course of this series will be located in either this folder or its subfolders.
  • Chief among them is that unlike Django, Flask lacks a large toolbox.
  • Then, you define two routes, one as the home view and the other as the about view.
  • Inside app/, create a folder static/; this is where we’ll put our web app’s images, CSS, and JavaScript files, so create folders for each of those, as demonstrated above.

Let’s create a couple of folders and files within flaskapp/ to keep our web app organized. In the preceding code block, you first import the Flask object from the flask package. You then use it to create your Flask application instance with the name app.

Table of Content – Flask Tutorial

It offers various ways to scale applications, whether by adopting microservices architecture or integrating with other tools for load balancing and performance optimization. This scalability ensures that Flask can handle growth and increased user demand effectively. Flask’s foundation in Python opens the door to seamless integration with a plethora of Python libraries. This allows developers to leverage a wide range of tools for various purposes, from data manipulation to machine learning integration, further enhancing the capabilities of Flask applications.

If the main purpose of your Flask project were to just display plain strings, then you’d be done. However, it’s more fun to actually display dynamic content to your users. In this case, you name the root folder of your project rp_flask_board/. The files and folders that you create over the course of this series will be located in either this folder or its subfolders. In this section, you’ll prepare the development environment for your Flask project.