Bug summary

When placing the y-label above the y-axis/spine, it gets clipped with constrained layout. It works OK with tight layout and on the left in constrained layout.

Code for reproduction

importmatplotlib.pyplotaspltx=range(10)lab="foo bar baz"# with extra space it works, but the second plot with two lines gets# clipped.fig0,axes0=plt.subplots(1,2,constrained_layout=True)[ax.plot(x,x)foraxinaxes0][ax.set_ylabel("\n".join([lab]*(i+1)),y=1.0,rotation="horizontal",horizontalalignment="left",multialignment="left",)fori,axinenumerate(axes0)]# single plot with one line also gets clippedfig1,ax1=plt.subplots(constrained_layout=True)ax1.plot(x,x)ax1.set_ylabel(lab,y=1.0,rotation="horizontal",horizontalalignment="left",multialignment="left",)# For reference it works fine when placing the ylab on the 'side'# as a conventional matplotlib plotfig2,ax2=plt.subplots(constrained_layout=True)ax2.plot(x,x)ax2.set_ylabel(f"{lab}\n{lab}",rotation="horizontal",horizontalalignment="right",multialignment="right",)fori,figinenumerate((fig0,fig1,fig2)):fig.savefig(f"fig{i}.png")

Actual outcome

The y-label gets clipped. The second plot should have a two line long y label.

It also happens with a y-label that is just one line:

Expected outcome

I would expect the y label to be included, even when putting it above the axis. Example with tight layout (fig1.tight_layout())

Additional information

Ithink this is a bug(?).
I have tried various vertical alignments, and it doesn't make much of a difference. I also tried to follow the legendset_in_layout-example in theconstrained layout guide without much luck.

A temporary fix is to set the title to' ' or increasing the constrained layout padding, I guess.

Note that constrained layout works as expected with long y-labels on the left:

Operating system

Windows

Matplotlib Version

3.8.0

Matplotlib Backend

module://matplotlib_inline.backend_inline, but present in saved figures (savefig)

Python version

3.12.1

Jupyter version

Jupyter console 6.6.3

Installation

conda