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3.15.0: Attention macOS 27.0 IDLE or tkinter users #157

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hugovk merged 1 commit into from
Oct 9, 2026
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3.15.0: Attention macOS 27.0 IDLE or tkinter users #157

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7 changes: 7 additions & 0 deletions content/posts/python-3150-final-is-here/index.md
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Expand Up @@ -63,6 +63,13 @@ Some of the major new features and changes in Python 3.15 are:

For more details on the changes to Python 3.15, see [What’s new in Python 3.15](https://docs.python.org/3/whatsnew/3.15.html).

### Attention macOS 27.0 `IDLE` or `tkinter` users

When running IDLE or other GUI applications that use the `tkinter` module, these applications may hang when using an application's menu command that opens a dialog (for example, IDLE's `About IDLE`, `Settings`, and `Open Module` commands) resulting in a spinning beach ball with `Force Quit` needed.

This problem is due to an operating system behavior change in macOS 27.0 that is believed to affect all current versions of the Tk graphics toolkit and thus the `tkinter` module in all current Python versions.

If you depend on Tk-based applications (like IDLE) on macOS, you may want to consider deferring installing macOS 27.0 until a Tk or macOS workaround is available or testing that your application workflow is not affected. Follow issue [#158053](https://github.com/python/cpython/issues/158053) for updates.

## More resources

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