Flask introduction Python

In this video, I demonstrate how to build a full-stack web application that utilizes the Reddit API for data, and stores data in a simple JSON file. By the end of this tutorial, you will have a better understanding of how to leverage Python and Flask to build powerful and efficient web applications.

Flask introduction Python

Full stack Python web app

In this video, we are creating a Flask web application that utilizes the PRAW library to extract information from the Reddit API based on the subreddit name that the user inputs in the front-end.

We use:

  • Bootstrap for a bit of front-end styling
  • HTML and Jinja to render our app's data in the browser
  • Flask for the API
  • The Reddit API to provide our app with data
  • A simple JSON file to persist app data

Watch the full tutorial

Are you interested in hearing more about Flask, Python, Full-Stack Web Applications, and the Reddit API? If so, this video is perfect for you!

In the video, I demonstrate how to build a full-stack web application that utilizes the Reddit API for data, and stores data in a simple JSON file. By the end of this tutorial, you will have a better understanding of how to leverage Python and Flask to build powerful and efficient web applications.

The first thing we will do in this tutorial is to introduce Flask, which is a lightweight web framework that is easy to use and learn. Flask is written in Python and makes building web applications simpler and faster. With Flask, you can create powerful web applications with minimal effort.

We will then move on to building a full-stack web application that utilizes the Reddit API. This application will allow users to input a subreddit name, and then retrieve the 10 most popular hot posts from that subreddit. To do this, we will use the Python Reddit API Wrapper (PRAW) library, which provides a simple and easy-to-use interface for querying the Reddit API.

We will begin by importing the necessary libraries, JSON, Flask and PRAW. We will then initialize an instance of the Flask application and set up a connection to the Reddit API using the PRAW library. We will define a file name to store the data received from the Reddit API and create the default route for our web application.

In the default route, we will handle both GET and POST requests. When a POST request is made, we will extract the subreddit name from the form data submitted by the user and query the Reddit API using PRAW to extract the 10 most popular hot posts from that subreddit. The extracted data will be stored in a JSON file, and the API route function will load the data from that file to be passed to the front-end HTML template. Finally, we will render an HTML template using Jinja that displays the extracted data.

By the end of this tutorial, you will understand how to build a full-stack web application that utilizes Flask, Python, a third-party API, and simple data storage. We will cover topics such as routing, handling GET and POST requests, and integrating front-end HTML templates with Python code using Jinja.

So, if you're ready to learn Flask, Python, Full-Stack Web Applications, and the Reddit API, then watch the full tutorial and get started today!


What is a Python full stack web app?

A Flask Python full stack web app refers to a web application that has been built using the Flask web framework in Python, and which encompasses the entire tech stack required to run the web app. This includes the back-end, front-end, and database components.

With Flask, a developer can create the back-end of a web application, which handles data processing and storage, as well as routing and serving pages to users. Flask also supports the use of HTML templates, which allow developers to build the front-end of a web app by defining reusable and customizable components.

In addition to Flask, a full stack web app might include a database system such as MySQL, MongoDB, or PostgreSQL to store and retrieve data, and a front-end framework such as React or Angular to build the user interface and interact with the back-end. In the video, we use a simple JSON file as our database system.

What is Flask?

Flask is a micro web framework written in Python. It is classified as a microframework because it does not require particular tools or libraries, and is very easy to get started with. It is designed to keep the core of the application simple and flexible while still allowing developers to easily extend the functionality as needed.

Flask provides a wide range of features, including a built-in development server and support for handling HTTP requests and responses, template rendering, URL routing, session management, and more. Additionally, it is compatible with a wide range of libraries and tools, making it easy to add new functionality and extend the capabilities of the framework.

One of the biggest strengths of Flask is its flexibility. It is very lightweight and easy to use, making it a great choice for small projects and prototypes. However, it is also powerful enough to handle more complex applications and can scale to support larger projects as well.

Flask has a large and active community of developers, which means that there are many resources available for getting started, troubleshooting issues, and finding help as needed. Flask is a great choice for anyone looking to build web applications in Python.

How are HTML templates and Jinja used with Flask?

Flask, being a micro web framework, does not have built-in support for templating. Instead, Flask allows developers to use any templating engine they prefer. Jinja is one such popular templating engine that is often used with Flask.

Jinja is a templating engine that allows you to write templates using HTML, CSS, and JavaScript, and then use placeholders, also known as variables, to insert dynamic data into the templates. These variables can be passed to the templates using Python code. Flask provides an integration with Jinja, which makes it easy to render Jinja templates in response to incoming requests.

To use Jinja with Flask, you first need to create a template file, which is an HTML file with special syntax for placeholders. These placeholders are enclosed in double curly braces {{ }} and can be used to insert dynamic content into the HTML file.

When a request is made to the Flask application, the appropriate Python function is called to handle the request. This function may process data, interact with a database, or perform other tasks, and then it passes the necessary data to the template engine. The template engine then takes care of rendering the template with the data, replacing the placeholders with the actual values. Finally, the rendered HTML is sent back to the client as a response.

Flask's integration with Jinja makes it easy to create dynamic web pages by separating the presentation layer (HTML templates) from the application logic (Python code). This results in a cleaner, more maintainable codebase.

What is the Reddit API?

The Reddit API (Application Programming Interface) is a web-based interface that provides access to Reddit's content and functionality. It allows developers to interact with Reddit's servers programmatically and perform tasks such as reading and submitting posts, commenting on posts, and retrieving information about users and subreddits. The Reddit API uses HTTP requests to communicate with Reddit's servers and returns data in JSON format, which can be easily parsed and used in applications. With the Reddit API, developers can build custom applications and services that integrate with the Reddit platform.

What is PRAW (the Python Reddit API Wrapper)?

PRAW (Python Reddit API Wrapper) is a Python package that provides a simple and easy-to-use interface for accessing and interacting with the Reddit API. It allows developers to write scripts and applications that can perform various tasks on the Reddit platform, such as extracting data from subreddits, posting comments, and submitting links. PRAW abstracts away the complexity of working with the Reddit API and provides a more Pythonic interface to interact with the platform.

Watch the video for the full tutorial!