AttributeError: can't set attribute

[qianwu2]

Hi, I am running basemap version 1.3.4 Matplotlib 3.8 CentOS 7.8 Using conda. Python 3.10.2 I got this error.

cs = m.contourf(x,y,pot,levels=clevs, alpha=1,cmap=plt.cm.RdBu_r) Traceback (most recent call last): File "/glade/u/home/qwu/gtrSep20/tiegcmnmf22020duskmewmeridicon092420200506sep2120202324paperafreviewmgladepy310.py", line 500, in cs = m.contourf(x,y,pot,levels=clevs, alpha=1,cmap=plt.cm.RdBu_r) File "/glade/work/qwu/conda-envs/qwu-env0/lib/python3.10/site-packages/mpl_toolkits/basemap/init.py", line 548, in with_transform return plotfunc(self,x,y,data,*args,**kwargs) File "/glade/work/qwu/conda-envs/qwu-env0/lib/python3.10/site-packages/mpl_toolkits/basemap/init.py", line 3704, in contourf CS.collections,c = self._cliplimb(ax,CS.collections) File "/glade/work/qwu/conda-envs/qwu-env0/lib/python3.10/site-packages/matplotlib/_api/deprecation.py", line 164, in set return super().set(instance, value) AttributeError: can't set attribute

[molinav]

Hi, @qianwu2! Right now, the requirements file defines matplotlib >= 1.5, < 3.8; python_version >= "3.5", so matplotlib 3.8 falls outside the version range that is being tested.

In any case, I thank you for providing this feedback, because soon I will need to increase the upper pin for matplotlib to 3.9. I have not done it yet because I know that matplotlib 3.8 is bringing some changes that will break with basemap right now, so it is not only a matter of updating the requirements file.

[rcomer]

I just tried the first (contour) and last (nightshade) examples from the docs with Matplotlib v3.8. The same line in those methods,

CS.collections,c = self._cliplimb(ax,CS.collections)

falls over for me with AttributeError: property of 'QuadContourSet' object has no setter consistent with this stackoverflow question. Since the ContourSet is now itself a collection, I suspect you just need to pass CS itself to your _cliplimb method.

[molinav]

@rcomer Thanks a lot for pointing to the specific issue. I will try to address it as soon as possible, because the basemap release 1.4.0 should arrive soon, and updating the matplotlib pin to <3.9 is a must in my todo list for 1.4.0.

[molinav]

The fix proposed by @rcomer has been added to all the affected methods (contour, contourf and nightshade), and I have also added some simple tests to the test suite to ensure that now it is working.

Thanks for your help! I will close the issue now, you will be able to use matplotlib 3.8.x with the basemap release 1.4.0, which should take place in one or two days at maximum.

[qianwu2]

Many thanks for your help. Best, Qian

On Sun, Jan 7, 2024 at 1:59 PM Víctor Molina García < @.***> wrote:

Closed #594 https://github.com/matplotlib/basemap/issues/594 as completed.

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