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[Bug]: Any operation on matplotlib fails due to gtk4 backend error #25602

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mikayahlevi opened this issue Apr 2, 2023 · 3 comments
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[Bug]: Any operation on matplotlib fails due to gtk4 backend error #25602

mikayahlevi opened this issue Apr 2, 2023 · 3 comments
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GUI: gtk
Milestone
v3.7.1

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@mikayahlevi
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mikayahlevi commented Apr 2, 2023 •
edited by oscargus
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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
@oscargus
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oscargus commented 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_data takes 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_data

@oscargus
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oscargus commented Apr 3, 2023 •
edited
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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

if Gtk.check_version(4, 9, 3) is None:
css.load_from_data(style, -1)
else:
css.load_from_data(style.encode('utf-8'))

@ksunden
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ksunden commented 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.

@ksunden ksunden closed this as completed Apr 3, 2023
@QuLogic QuLogic added this to the v3.7.1 milestone Jul 5, 2023
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@QuLogic @ksunden @oscargus @mikayahlevi