Setting Backend to Automatic Fails to Plot - Fedora 33

Issue Report Checklist

• Searched the issues page for similar reports
• Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• Could not reproduce inside jupyter qtconsole (if console-related)
• Tried basic troubleshooting (if a bug/error)
  • Restarted Spyder
  • Reset preferences with spyder --reset
  • Reinstalled the latest version of Anaconda
  • Tried the other applicable steps from the Troubleshooting Guide
• Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

In setting Tools -> Preferences -> IPython Console -> Graphics -> Backend -> Automatic, plots fail to materialise, and error in interpreter window

TKinter works, but for some reason, the text in plots is not scaling, and everything is large, crayon type drawing. GTK3 causes Spyder to hang. I have raised bug with RedHat bug support (https://bugzilla.redhat.com/show_bug.cgi?id=1945943) but no response. I have searched QT bug reports too, and nothing similar.

If anything, just need confirmation that the issue is Spyder, QT5, or other, so i know who i need to progress with. Thanks.

What steps reproduce the problem?

1. Set the backend to automatic.
2. Run the simple plotting script
3. No plot window appears, and error in IPython window

What is the expected output? What do you see instead?

Output should be plot window, yet no plot window appears.

Paste Traceback/Error Below (if applicable)

Traceback (most recent call last):

  File "/home/richard/Documents/Math Python/Python For Finance/Ch1/untitled0.py", line 14, in <module>
    plt.plot(X, C)

  File "/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py", line 2840, in plot
    return gca().plot(

  File "/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py", line 2368, in gca
    return gcf().gca(**kwargs)

  File "/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py", line 747, in gcf
    return figure()

  File "/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py", line 687, in figure
    figManager = new_figure_manager(num, figsize=figsize,

  File "/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py", line 315, in new_figure_manager
    return _backend_mod.new_figure_manager(*args, **kwargs)

  File "/usr/lib64/python3.9/site-packages/matplotlib/backend_bases.py", line 3494, in new_figure_manager
    return cls.new_figure_manager_given_figure(num, fig)

  File "/usr/lib64/python3.9/site-packages/matplotlib/backend_bases.py", line 3499, in new_figure_manager_given_figure
    canvas = cls.FigureCanvas(figure)

  File "/usr/lib64/python3.9/site-packages/matplotlib/backends/backend_qt5agg.py", line 21, in __init__
    super().__init__(figure=figure)

  File "/usr/lib64/python3.9/site-packages/matplotlib/backends/backend_qt5.py", line 219, in __init__
    _create_qApp()

  File "/usr/lib64/python3.9/site-packages/matplotlib/backends/backend_qt5.py", line 126, in _create_qApp
    qApp = QtWidgets.QApplication(["matplotlib"])

  File "/usr/lib/python3.9/site-packages/spyder_kernels/customize/spydercustomize.py", line 160, in __init__
    super(SpyderQApplication, self).__init__(*args, **kwargs)

TypeError: super(type, obj): obj must be an instance or subtype of type

Versions

• Spyder version: 4.1.5 None
• Python version: 3.9.2 64-bit
• Qt version: 5.15.2
• PyQt5 version: 5.15.0
• Operating System: Linux 5.11.11-200.fc33.x86_64 Fedora 33

Dependencies

# Mandatory:
atomicwrites >=1.2.0           :  1.4.0 (OK)
chardet >=2.0.0                :  3.0.4 (OK)
cloudpickle >=0.5.0            :  1.5.0 (OK)
diff_match_patch >=20181111    :  20200713 (OK)
intervaltree                   :  None (OK)
IPython >=4.0                  :  7.18.1 (OK)
jedi =0.17.1                   :  0.17.1 (OK)
keyring                        :  None (OK)
nbconvert >=4.0                :  5.6.1 (OK)
numpydoc >=0.6.0               :  0.9.2 (OK)
parso =0.7.0                   :  0.7.0 (OK)
pexpect >=4.4.0                :  4.8.0 (OK)
pickleshare >=0.4              :  0.7.5 (OK)
psutil >=5.3                   :  5.7.2 (OK)
pygments >=2.0                 :  2.6.1 (OK)
pylint >=1.0                   :  2.6.0 (OK)
pyls >=0.34.0;<1.0.0           :  0.34.1 (OK)
qdarkstyle >=2.8               :  2.8 (OK)
qtawesome >=0.5.7              :  0.7.3 (OK)
qtconsole >=4.6.0              :  4.7.7 (OK)
qtpy >=1.5.0                   :  1.9.0 (OK)
sphinx >=0.6.6                 :  3.2.1 (OK)
spyder_kernels >=1.9.4;<1.10.0 :  1.9.4 (OK)
watchdog                       :  None (OK)
xdg >=0.26                     :  0.26 (OK)
zmq >=17                       :  19.0.0 (OK)

# Optional:
cython >=0.21                  :  0.29.21 (OK)
matplotlib >=2.0.0             :  3.3.4 (OK)
numpy >=1.7                    :  1.19.4 (OK)
pandas >=0.13.1                :  1.0.5 (OK)
scipy >=0.17.0                 :  1.5.4 (OK)
sympy >=0.7.3                  :  1.7.1 (OK)

[nikeshocks65]

I am able to reproduce this issue in spyder 5.0.4 with more recent dependencies:

Version

• Spyder version: 5.0.4 None
• Python version: 3.9.5 64-bit
• Qt version: 5.15.2
• PyQt5 version: 5.15.0
• Operating System: Linux 5.12.11-300.fc34.x86_64 (Fedora 34)

Dependencies

Mandatory:

atomicwrites >=1.2.0 : 1.4.0 (OK) chardet >=2.0.0 : 4.0.0 (OK) cloudpickle >=0.5.0 : 1.6.0 (OK) cookiecutter >=1.6.0 : 1.7.2 (OK) diff_match_patch >=20181111 : 20200713 (OK) intervaltree >=3.0.2 : 3.1.0 (OK) IPython >=7.6.0 : 7.20.0 (OK) jedi =0.17.2 : 0.17.2 (OK) jsonschema >=3.2.0 : 3.2.0 (OK) keyring >=17.0.0 : 22.0.1 (OK) nbconvert >=4.0 : 6.0.7 (OK) numpydoc >=0.6.0 : 1.1.0 (OK) parso =0.7.0 : 0.7.0 (OK) pexpect >=4.4.0 : 4.8.0 (OK) pickleshare >=0.4 : 0.7.5 (OK) psutil >=5.3 : 5.8.0 (OK) pygments >=2.0 : 2.7.4 (OK) pylint >=1.0 : 2.6.0 (OK) pyls >=0.36.2;<1.0.0 : 0.36.2 (OK) pyls_black >=0.4.6 : 0.4.6 (OK) pyls_spyder >=0.3.2;<0.4.0 : 0.3.2 (OK) qdarkstyle =3.0.2 : 3.0.2 (OK) qstylizer >=0.1.10 : 0.2.0 (OK) qtawesome >=1.0.2 : 1.0.2 (OK) qtconsole >=5.1.0 : 5.1.0 (OK) qtpy >=1.5.0 : 1.9.0 (OK) rtree >=0.9.7 : 0.9.7 (OK) setuptools >=39.0.0 : 53.0.0 (OK) sphinx >=0.6.6 : 3.4.3 (OK) spyder_kernels >=2.0.4;<2.1.0 : 2.0.4 (OK) textdistance >=4.2.0 : 4.2.1 (OK) three_merge >=0.1.1 : 0.1.1 (OK) watchdog >=0.10.3 : 1.0.2 (OK) xdg >=0.26 : 0.27 (OK) zmq >=17 : 22.0.3 (OK)

Optional:

cython >=0.21 : 0.29.21 (OK) matplotlib >=2.0.0 : 3.4.2 (OK) numpy >=1.7 : 1.20.1 (OK) pandas >=1.1.1 : 1.2.1 (OK) scipy >=0.17.0 : 1.6.2 (OK) sympy >=0.7.3 : 1.8 (OK)

Traceback: ` File “/home/cole/Documents/untitled2.py”, line 14, in <module> plt.plot(X, C)

File “/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py”, line 3019, in plot return gca().plot(

File “/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py”, line 2532, in gca return gcf().gca(**kwargs)

File “/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py”, line 854, in gcf return figure()

File “/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py”, line 797, in figure manager = new_figure_manager(

File “/usr/lib64/python3.9/site-packages/matplotlib/pyplot.py”, line 316, in new_figure_manager return _backend_mod.new_figure_manager(*args, **kwargs)

File “/usr/lib64/python3.9/site-packages/matplotlib/backend_bases.py”, line 3545, in new_figure_manager return cls.new_figure_manager_given_figure(num, fig)

File “/usr/lib64/python3.9/site-packages/matplotlib/backend_bases.py”, line 3550, in new_figure_manager_given_figure canvas = cls.FigureCanvas(figure)

File “/usr/lib64/python3.9/site-packages/matplotlib/backends/backend_qt5agg.py”, line 21, in init super().init(figure=figure)

File “/usr/lib64/python3.9/site-packages/matplotlib/backends/backend_qt5.py”, line 213, in init _create_qApp()

File “/usr/lib64/python3.9/site-packages/matplotlib/backends/backend_qt5.py”, line 119, in _create_qApp qApp = QtWidgets.QApplication([“matplotlib”])

File “/usr/local/lib/python3.9/site-packages/spyder_kernels/customize/spydercustomize.py”, line 163, in init super(SpyderQApplication, self).init(*args, **kwargs)

TypeError: super(type, obj): obj must be an instance or subtype of type`

[ccordoba12]

I think this bug is legit. We’ll try to address it in a future version.