Moreover, I have worked on a lot of code where ellipsis is used to mean "this branch isn't implemented yet, but doing nothing isn't terrible." I don't love that code. I'd rather it use `pass` and a clarifying comment. But this change would make all that existing code much more broken. On Sat, Apr 29, 2023, 9:22 AM Al Sweigart wrote:

I agree. Giving punctuation-based syntax like ... a meaning that isn't obvious on reading the code makes for unreadable code. Whereas having `raise Exception ('TODO')` accomplishes the same thing but also allows English documentation. The ... here is open to interpretation, especially as a new feature to an old established language like Python.

On Thu, Apr 27, 2023, 10:07 AM Antoine Rozo wrote:

...

Raising an exception in that case would be a breaking change only for an aesthetic preference. Some codes use ellipsis as this in functions body and don't want it to raise an error. Also it's going to be confusing to understand why an exception is raised in that place.

Le jeu. 27 avr. 2023 à 15:50, haael a écrit :

...

In examples in the web very often we see unfinished or partial code, where the ellipsis "..." is used in place of missing instructions.

Idea: make ellipsis used in that context throw an exception, reminding the user that this code is work in progress.

The exception could be called ToDoError, or WorkInProgressError, or simply EllipsisError, and could be derived from NotImplementedError.

```

def my_fun(): ... # todo

my_fun()

...

WorkInProgressError: Implementation of `my_fun` is not finished.

```

This change could break some code, as for now ellipsis in the middle of code is silently ignored, but I don't think anybody seriously relies on that behavior.

haael

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