Import Errors of Upgrading to latest version

[kattt999]

Hi, we have a project with rich == 12.5.1, textual == 0.1.18. When I tried to upgrade the dependencies to latest versions, I met the problems
line 92, in __getattr__ raise ImportError(f"Package 'textual.widgets' has no class '{widget_class}'") ImportError: Package 'textual.widgets' has no class 'TreeClick'

Have anyone met this before and how you solved it?

[TomJGooding]

Textual has probably had a few breaking changes since v0.1.18!

Your project would likely need pretty significant changes to update to a more up-to-date version of Textual, more than just your error about the missing TreeClick class.

[davep]

As @TomJGooding points out above, a lot has changed in Textual since 0.1.18, the most significant changes been with the release of 0.2.0, where large parts of the API were changed, support for styling with CSS was added, and a bunch of other things. We've now currently on 0.28.1.

In that time Textual has had extensive documentation added too; I'd suggest perhaps having a read through that (especially the tutorial) to get a feel for how to work with Textual now. As Tom mentions above, moving a Textual application from being based on 0.1.x to anything from 0.2.x onwards will take some work (note though that the API is a lot more stable now),