Thanks! What input reproduces this? It would be good to get a test so it does not come back.

Looks like you just need to specify one of the args, i.e., in a REPL:

>>> import matplotlib.pyplot as plt
>>> plt.GridSpec(2, 2, height_ratios=(1, 2))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "lib/matplotlib/gridspec.py", line 52, in __repr__
    if self._row_height_ratios is not None else '')
TypeError: not all arguments converted during string formatting

Owee, I'm MrMeeseeks, Look at me.

There seem to be a conflict, please backport manually. Here are approximate instructions:

1. Checkout backport branch and update it.

$ git checkout v3.2.x
$ git pull

2. Cherry pick the first parent branch of the this PR on top of the older branch:

$ git cherry-pick -m1 7c2057b7647648388b923af3a4568700fcd10395

3. You will likely have some merge/cherry-pick conflict here, fix them and commit:

$ git commit -am 'Backport PR #17131: BUG: Fix formatting error in GridSpec.__repr__'

4. Push to a named branch :

git push YOURFORK v3.2.x:auto-backport-of-pr-17131-on-v3.2.x

5. Create a PR against branch v3.2.x, I would have named this PR:

"Backport PR #17131 on branch v3.2.x"

And apply the correct labels and milestones.

Congratulation you did some good work ! Hopefully your backport PR will be tested by the continuous integration and merged soon!

If these instruction are inaccurate, feel free to suggest an improvement.

Looks like this never worked with the ratios back to when it came in for 3.0.