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[Bug]: Any operation on matplotlib fails due to gtk4 backend error #25602
Description
Bug summary
This may be an Arch Linux dependency issue, but when using GTK4 as the backend any operation that involves a window will crash the Python program.
Code for reproduction
import matplotlib.pyplot as plt
fig, ax = plt.subplots()Actual outcome
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/pyplot.py", line 1450, in subplots
fig = figure(**fig_kw)
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/_api/deprecation.py", line 454, in wrapper
return func(*args, **kwargs)
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/pyplot.py", line 783, in figure
manager = new_figure_manager(
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/pyplot.py", line 359, in new_figure_manager
return _get_backend_mod().new_figure_manager(*args, **kwargs)
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/backend_bases.py", line 3513, in new_figure_manager
return cls.new_figure_manager_given_figure(num, fig)
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/backend_bases.py", line 3518, in new_figure_manager_given_figure
return cls.FigureCanvas.new_manager(figure, num)
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/backend_bases.py", line 1703, in new_manager
return cls.manager_class.create_with_canvas(cls, figure, num)
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/backend_bases.py", line 2830, in create_with_canvas
return cls(canvas_class(figure), num)
File "/home/mikayah/.local/lib/python3.10/site-packages/matplotlib/backends/backend_gtk4.py", line 79, in __init__
**css.load_from_data(b".matplotlib-canvas { background-color: white; }")
TypeError: Gtk.CssProvider.load_from_data() takes exactly 3 arguments (2 given)**
Expected outcome
Not crashing
Additional information
No response
Operating system
Arch
Matplotlib Version
3.6.3
Matplotlib Backend
GTK4Agg
Python version
3.10.10
Jupyter version
No response
Installation
Linux package manager
Activity
oscargus commentedon Apr 3, 2023
Strange. I am in no way an expert on this, but did a quick search and in the C/C++ interface
load_from_datatakes another argument, the length of the "string" (byte-sequence). However, the Python binding only takes the "string": https://amolenaar.github.io/pgi-docgen/#Gtk-4.0/classes/CssProvider.html#Gtk.CssProvider.load_from_dataoscargus commentedon Apr 3, 2023
On the other hand there was a fix in #25280 that seems very related. This was merged into 3.7.1, so if you get hold of the latest Matplotlib version, it should work!(?)
matplotlib/lib/matplotlib/backends/backend_gtk4.py
Lines 78 to 81 in 5ce21e3
ksunden commentedon Apr 3, 2023
Given this does appear to be addressed on
main(and even a release) already, as @oscargus points out, I'll go ahead and close this, feel free to re-ping us/reopen if that does not actually address the issue.