On second thought, that output is also in https://matplotlib.org/3.6.0/tutorials/introductory/quick_start.html#a-simple-example which is counter to what I expected so maybe they are useless...

There is clearly something I do not understand about sphinx-gallery here.

Yes, @jklymak added these on purpose to suppress the output #21794, but they didn't seem to have worked.

IMHO we should to discuss with sphinx-gallery to make showing outputs configurable. Even if the semicolon worked it can be a little confusing for users not familiar with it.

Ideally that option could be configured on a global/file/block basis and be overridden by the more specific ones; i.e. global=off, this block=on.

You can now configure capture_repr on file-by-file basis, see sphinx-gallery/sphinx-gallery#891. It just didn't have the time to apply this to the matplotlib docs.
So the plan is to globally turn off capturing and revert this in the couple of examples where it's needed, i.e. it basically just requires to go through the examples and tutorials and set the capturing where needed.

There is clearly something I do not understand about sphinx-gallery here.

@tacaswell : as I explained in sphinx-gallery/sphinx-gallery#891: putting a semicolon after the last expression doesn't work here as the code is first compiled into an AST and then the last expression is taken from the tree where the semicolon as code delimiter isn't present, see code.

Superseded by #23978 .

@gustavi thank you for your effort, even though we found different solution to solve the issue.

@timhoffm in fact the PR is still valid - the semicolons are useless in this case (see #23796 (comment)) and should be removed (along with the corresponding flake ignore)

@StefRe thanks for the correction.

"power cycled" to get the azure to re-run

Thanks @gustavi, and congratulations on your first contribution to Matplotlib!