Closed
Description
Bug report
Bug summary
When trying to run matplotlib pyplot, and setting the backend to gtk3agg or gtk3cairo, the following error is encountered in wayland session. The same code works fine in Xorg, or using Qt backend.
Gdk-Message: 12:41:05.918: Unable to load fleur from the cursor theme
Traceback (most recent call last):
File "/usr/lib/python3.9/site-packages/matplotlib/backends/backend_gtk3.py", line 40, in <module>
cursors.MOVE: Gdk.Cursor.new(Gdk.CursorType.FLEUR),
TypeError: constructor returned NULL
Code for reproduction
import matplotlib.pyplot as plt
fig, ax0 = plt.subplots()
ax0.plot(1,1)
plt.show()Actual outcome
Traceback (most recent call last):
File "/usr/lib/python3.9/site-packages/matplotlib/backends/backend_gtk3.py", line 40, in <module>
cursors.MOVE: Gdk.Cursor.new(Gdk.CursorType.FLEUR),
TypeError: constructor returned NULL
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/yl398/test.py", line 1, in <module>
import matplotlib.pyplot as plt
File "/usr/lib/python3.9/site-packages/matplotlib/pyplot.py", line 2336, in <module>
switch_backend(rcParams["backend"])
File "/usr/lib/python3.9/site-packages/matplotlib/pyplot.py", line 276, in switch_backend
class backend_mod(matplotlib.backend_bases._Backend):
File "/usr/lib/python3.9/site-packages/matplotlib/pyplot.py", line 277, in backend_mod
locals().update(vars(importlib.import_module(backend_name)))
File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "/usr/lib/python3.9/site-packages/matplotlib/backends/backend_gtk3agg.py", line 8, in <module>
from . import backend_agg, backend_gtk3
File "/usr/lib/python3.9/site-packages/matplotlib/backends/backend_gtk3.py", line 49, in <module>
raise ImportError(exc) from exc
ImportError: constructor returned NULL
Expected outcome
No error should be encountered and the figure should show on the screen
Matplotlib version
- Operating system: Manjaro Linux 20.2.1
- Matplotlib version (
import matplotlib; print(matplotlib.__version__)): 3.3.3 - Matplotlib backend (
print(matplotlib.get_backend())): GTK3AGG or GTK3Cairo - Python version: 3.9.1
- Jupyter version (if applicable):
- Other libraries:
Installed matplotlib from default manjaro/arch linux repository.