Upgrading flask-based project from flask v.0.12.x to 1.0.x I realized that Flask itself doesn’t ready for upgrades yet.
There is no documentation about 0.x -> 1.0 upgrade at all. There is some documentation about upgrades prior 1.0 but nothing about 1.0 at all! Change log isn’t helpful a lot.
It’s one more argument to use Django instead of Flask. It has great release notes with detailed backward incompatible and deprecation sections.