The information below was sent out to people who submitted a Python-based Fusion add-in on the App Store, but it’s worth letting all Fusion developers know about this.
Python Update
The first is an upgrade of the Python version used in Fusion from 3.12 to 3.14. We don’t expect this change to break any apps, but everyone should test their apps to ensure they continue to function as expected. The apps that we know will be affected are those that deliver their app using compiled Python modules (.pyc files). Compiled modules are only compatible with the minor release of Python used to create them, which means Add-ins compiled with Python 3.12 will fail to load with the new version (3.14). If you deliver the .py source files, it’s not a problem, as Python will automatically compile them to create new local .pyc files.
If you are delivering .pyc files, use an Insider build of the January release and run your add-in on your computer to generate updated .pyc files, which you can then deliver to your app. If you’re not a Fusion Insider, read this forum post to learn how to join.
Intent-Driven Design
The other significant change with broader impact is the introduction of Intent-Driven Design. It has been available as a preview feature, but it will be enabled for everyone in the January release. This new design-intent experience has three design types: hybrid, part, and assembly. Hybrid is the design type that Fusion has always supported. The part and assembly design types are new. If a user uses the Hybrid design type, your app should run as before with no change. However, for part or assembly designs, there are significant changes to the user interface and how Fusion behaves. It’s likely you will need to make changes to ensure your app is fully supported. For more information, see the new Programming for Design Intent topic in the API User Manual, which you should be able to access as a Fusion Insider.
If the link does not work, you can also reach the page this way:
1) Log in to the Insider website.
2) Click the “Preview Documentation” link, as shown below.
3) Open the “Programming for Design Intent” link, as shown below.
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