Flash 2.0 was released on May 11, dropping support for Python 3.5 and Python 2 and only supporting Python 3.6 and above. Other major updates are as follows: added route decorator, changed JSON module, improved config.from_file function, added type hint, optimized error message.
Flask is a lightweight Web application framework written in Python. The WSGI toolkit uses Werkzeug and the template engine uses Jinja2. Flask uses BSD authorization. Flask is also known as a “microframework” because it uses a simple core and adds additional functionality with Extension. Flask has no default database, form validation tools.
The complete Release Notes:flask.palletsprojects.com/en/2.0.x/
