Flask v2.0 Release

Flask v2.x version summary

This page summarizes all updates provided by version 2.0 of Flask.

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Flask 2.0 highlights

Blueprints

Starting with 2.0 version Blueprints can be nested under each other. This feature might improve the design of complex products.

Flask Shell

Tab completion is now supported for all registered entities (variables, classes)

Config from file

Re-add deprecated Config.from_json, which was accidentally removed early.

Improved CLI errors

When an app could not be loaded, errors are displayed instantly when the development server is active.

FLASK_DEBUG is deprecated

Replaced by FLASK_ENV, a more current environment variable.

Language Detection

langdetect package is used by default.

Improved Static files cache - on development

Browsers will cache static files based on file content rather than a 12-hour refresh time frame.

Free Starters upgraded to Flask 2.0

• Flask Bootstrap 5 Volt - open-source starter

• Flask Datta Able - open-source seed project

• Flask Soft UI Design - Bootstrap 5 design

Soft UI Design - Flask 2.x Free Starter