bad display dvipng - python-3.x

Question

import sys
from PyQt5.QtWidgets import *
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib import rc
rc("text", usetex=True)
app = QApplication(sys.argv)
fen = QDialog()
figure = Figure()
canvas = FigureCanvas(figure)
text_edit = QTextEdit()
list_widget = QListWidget()
layout = QHBoxLayout()
layout.addWidget(canvas)
layout.addWidget(text_edit)
fen.setLayout(layout)
def change():
text = figure.suptitle(
r'{}'.format(text_edit.toPlainText()),
x=0.0,
y=1.0,
horizontalalignment='left',
verticalalignment='top'
)
canvas.draw()
text_edit.textChanged.connect(change)
fen.show()
app.exec_()
I have this error:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/matplotlib/texmanager.py", line 486, in make_png
stderr=subprocess.STDOUT)
File "/usr/lib/python3.6/subprocess.py", line 356, in check_output
**kwargs).stdout
File "/usr/lib/python3.6/subprocess.py", line 438, in run
output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['dvipng', '-bg', 'Transparent', '-D', '100.0', '-T', 'tight', '-o', 'b31418787d5e331336f86388cc930ab9.png', 'c073de3d59bf9cbb888f5b9c550ef4f8.dvi']' returned non-zero exit status 1.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/loic/Application_math/test.py", line 31, in change
canvas.draw()
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_qt5agg.py", line 127, in draw
super(FigureCanvasQTAggBase, self).draw()
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 430, in draw
self.figure.draw(self.renderer)
File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 1299, in draw
renderer, self, artists, self.suppressComposite)
File "/usr/lib/python3/dist-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
a.draw(renderer)
File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 55, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3/dist-packages/matplotlib/text.py", line 762, in draw
mtext=mtext)
File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 250, in draw_tex
Z = texmanager.get_grey(s, size, self.dpi)
File "/usr/lib/python3/dist-packages/matplotlib/texmanager.py", line 545, in get_grey
pngfile = self.make_png(tex, fontsize, dpi)
File "/usr/lib/python3/dist-packages/matplotlib/texmanager.py", line 493, in make_png
exc.output.decode("utf-8"))))
RuntimeError: dvipng was not able to process the following string:
b''
Here is the full report generated by dvipng:
c073de3d59bf9cbb888f5b9c550ef4f8.dvi: No such file or directory
This is dvipng 1.16 Copyright 2002-2015, 2019 Jan-Ake Larsson
rc("text", usetex=True)
This line causes the error but I don't see how to correct it.
I tried to install/uninstall MiKTeX 10 times and nothing changes I still have the error.
Same issue here RuntimeError: LaTeX was not able to process the following string: r'lb' But no solution for me
I found what doesn't fit.
It's just the blank lines.
There's a way to pass empty lines? if I can't air it out its not very useful ^^