Indigo's scripting, plugin framework, and some internal functionality have used Python 2 for many years. Indigo has a considerable amount of internal Python code, and all 3rd party plugins that are available in our plugin store are developed using Python. This has always relied on the Python 2 installation that was included with macOS.
Apple has been signaling for a while that they will be removing all Python (and other open source scripting technologies) in future releases. Python 2 especially is an issue because it is no longer supported with bug and security fixes. With macOS Monterey, they began showing a dialog at launch time for any app that links against Python (and presumably others as well), so we knew that Apple was serious about this for the next major macOS release.
The upgrade from Python 2 to Python 3 is not an automatic process, but rather requires code changes. Therefore, the plan for 2022 releases (with respect to Python, there will be other changes as well) is as follows:
The conversion of all of our Python assets is underway using a very early internal build of Indigo, and we will be communicating with our 3rd party developers soon for what they can start doing now to prepare their plugin code bases.
We know that this transition will be, for some, somewhat painful. To be honest, that's been one of the reasons why we've pushed it out as long as we have. But aside from the obvious realities, Python 3 will bring a lot of benefits to the platform moving forward:
As always, we appreciate our loyal user community and your continued support.