Python 3.9 support graph for the 360 most popular Python packages!
There can be many reasons a package is not explicitly supporting Python 3.9:
If you are package maintainer, it's time to start supporting Python 3.9. If you are not able to give the time needed, please seek for help from the community.
If you are user of the package, send a friendly note to the package maintainer. Or fork it, and send a pull request to help move the project towards Python 3.9 support, by adding the classifier and ensuring the project is tested against Python 3.9.
We look for the Programming Language :: Python :: 3.9 classifier on the latest release of the project, via PyPI's JSON API.
This is derivative work from py3readiness.org, a site that tracks general compatibility with Python 3, which in turn is a derivative of pythonwheels.com, a site that tracks which Python distributions ship the wheel distribution.