29 Mar Flask Python Tutorial: What It is and How to Install
However, if you want to work on bigger projects, this structure can be limiting because you’d need to add more and more code to app.py. Instead, you’ll adjust the structure a bit to create a more scalable Flask project. The Flask project that you’ll build in this tutorial will be very generic. For example, maybe you’ll want to add a database or implement logging and notification messages. However, you should be comfortable using the terminal and have basic knowledge of Python. Although it helps to know about virtual environments and pip, you’ll learn how to set everything up as you work through the tutorial.
It is developed by Armin Ronacher who leads an international group of python enthusiasts (POCCO). In this step, you’ll add a few routes to your application to display different pages depending on the requested URL. The following tutorials will guide you through
more advanced topics and provide solid learning materials, especially when
combined with the example real-world projects listed in the next section. The «Hello, World!» code for Flask is just seven lines of code but learning how
to build full-featured web applications with any framework takes a lot of work. These resources listed below are the best up-to-date tutorials and references
for getting started.
Learn Latest Tutorials
While both are designed to make web development easier and more efficient, they have distinct differences that cater to different needs and preferences. The official
tutorial in the Python docs is a great way to learn or review first. An interesting case is that if the defined route had a trailing slash and the client asked for the route without the slash, you wouldn’t need to double up on decorators. It looks very similar to the Task object; you’ll find that most objects have the same basic format of class attributes as table columns. Every once in a while, you’ll run into something a little different, including some multiple-inheritance magic, but this is the norm. In Flask, a many-to-one relationship can be specified using the db.relationship function.
Instance folders allow us to segregate deployment-specific files from our version-controlled application. In this recipe, we will create an instance folder, which will act like a holder bin for such kinds of files. Flask can be simply installed using pip/pip3 or easy_install globally, but it’s preferable to set up an application environment using virtualenv. This prevents the global Python installation from being affected by a custom installation, as it creates a separate environment for the application. Virtualenv manages this in separate environments and does not let the incorrect version of any library affect any application.
Token-Based Authentication With Flask
In this example, I’ll use PostgreSQL (mainly because I’ve used it a lot), so the intermediary to talk to the Postgres database is the psycopg2 package. Make sure psycopg2 is installed in your environment and include it in the list of required packages in setup.py. You flask developer don’t have to do anything else with it; flask-sqlalchemy will recognize Postgres from the database URL. In todo/app.py, you’ll create an app object, which is an instance of the Flask object. It’ll act as the central configuration object for the entire application.
- With the help of Cascading Style Sheets (CSS), you can style the content.
- The route is ‘/api/v1/accounts//tasks’, where is a route variable.
- When we configure a Flask application, we’re able to do so as per the need.
- To install flask on the system, we need to have python 2.7 or higher installed on our system.
- Chapter 3, Data Modeling in Flask, deals with one of the most important parts of any application, that is, its interaction with database systems.
However, the advanced features of Flask make it a good choice for more experienced developers as well. Once the installation has finished, we can use the Flask command line interface to create a new project. In this tutorial, we will be creating a simple Flask app using Python.
Extensions, Plug-ins and Related Libraries &
Your base template is designed to provide a consistent structure for your project while allowing flexibility in specific parts of the content through Jinja’s block functionality. Next, create the child templates that extend base.html and fill in these blocks with their specific content. Next, let’s create a folder called static in our web application project’s root directory for storing static files like images and text files. On the other hand, Flask, created by Armin Ronacher, is a battle-tested veteran in the Python web development ecosystem. Known for its simplicity, extensibility, and lightweight nature, Flask has been a go-to choice for many developers building web applications and APIs alike. Its flexibility and ease of use have made it a popular choice for projects of varying complexity.
In this Flask tutorial, you create a simple Flask app with three pages that use a common base template. Along the way, you experience a number of features of Visual Studio Code including using the terminal, the editor, the debugger, code snippets, and more. By adding the CSS file reference to base.html, you’re again taking advantage of the inheritance mechanism that Jinja templates provide. You only need to add styles.css in your base template to make it present in your child templates.
Step 2 — Creating a Simple Application
In Flask projects, you commonly save CSS files in a static/ directory. In this project, you’ll only work with one CSS file named styles.css. But if you decide to expand https://remotemode.net/ the project at some point, you can also use this folder to store images or JavaScript files. Your current project structure is great for starting a Flask project.
