Welcome to Flask — Flask Documentation (3.1.x)
Flask provides configuration and conventions, with sensible defaults, to get started. This section of the documentation explains the different parts of the Flask framework and how they can be …
Installation — Flask Documentation (3.1.x)
Flask is now installed. Check out the Quickstart or go to the Documentation Overview.
Quickstart — Flask Documentation (3.1.x)
Flask provides a really simple way to give feedback to a user with the flashing system. The flashing system basically makes it possible to record a message at the end of a request and …
Tutorial — Flask Documentation (3.1.x)
Check out the Quickstart for an overview of what Flask can do, then dive into the docs to find out more. The tutorial only uses what’s provided by Flask and Python.
Project Layout — Flask Documentation (3.1.x)
Then follow the installation instructions to set up a Python virtual environment and install Flask for your project. The tutorial will assume you’re working from the flask-tutorial directory from now on.
API — Flask Documentation (3.1.x)
Flask parses incoming request data for you and gives you access to it through that global object. Internally Flask makes sure that you always get the correct data for the active thread if you are …
Using async and await — Flask Documentation (3.1.x)
Traditional Flask views will still be appropriate for most use cases, but Flask’s async support enables writing and using code that wasn’t possible natively before.
Application Structure and Lifecycle — Flask Documentation (3.1.x)
The first step in creating a Flask application is creating the application object. Each Flask application is an instance of the Flask class, which collects all configuration, extensions, and …
Testing Flask Applications — Flask Documentation (3.1.x)
Testing Flask Applications ¶ Flask provides utilities for testing an application. This documentation goes over techniques for working with different parts of the application in tests. We will use the …
Application Setup — Flask Documentation (3.1.x)
The most straightforward way to create a Flask application is to create a global Flask instance directly at the top of your code, like how the “Hello, World!” example did on the previous page.