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MJKirk opened this issue May 11, 2021 · 2 comments
Closed

Tkagg backend prints backtrace in some circumstances #20204

MJKirk opened this issue May 11, 2021 · 2 comments
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GUI: tk
Milestone
v3.4.0

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@MJKirk
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MJKirk commented May 11, 2021 •
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Bug report

When using the tkagg backend, a backtrace gets printed, although it doesn't stop and the script finishes normally.
It only seems to happen if you save a figure to a PDF, and then save to a PNG with the bbox_inches="tight" option.
Doing just PNG with tight bbox, or PDF then PNG without tight bbox doesn't output the backtrace.

Code for reproduction

import matplotlib
print("Backend = ", matplotlib.get_backend())
import matplotlib.pyplot as plt
plt.plot((1,2),(3,4))
print("savefig to PDF")
plt.savefig("fig.pdf")
print("savefig to PNG")
plt.savefig("fig.png", bbox_inches="tight")
print("Done")

Actual outcome

Backend =  TkAgg
savefig to PDF
savefig to PNG
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.6/tkinter/__init__.py", line 1705, in __call__
    return self.func(*args)
  File "/usr/lib/python3.6/tkinter/__init__.py", line 749, in callit
    func(*args)
  File "/home/kirkmatt/tktest/lib/python3.6/site-packages/matplotlib/backends/_backend_tk.py", line 253, in idle_draw
    self.draw()
  File "/home/kirkmatt/tktest/lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 9, in draw
    super(FigureCanvasTkAgg, self).draw()
  File "/home/kirkmatt/tktest/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py", line 407, in draw
    self.figure.draw(self.renderer)
  File "/home/kirkmatt/tktest/lib/python3.6/site-packages/matplotlib/backend_bases.py", line 1544, in _draw
    def _draw(renderer): raise Done(renderer)
matplotlib.backend_bases._get_renderer.<locals>.Done: <matplotlib.backends.backend_agg.RendererAgg object at 0x7f019bb6b5c0>
Done

Expected outcome
The exception is caught somewhere and no backtrace is printed.

Matplotlib version

  • Operating system: Ubuntu 18.04
  • Matplotlib version: 3.3.4
  • Matplotlib backend: TkAgg
  • Python version: 3.6.9
  • Other libraries: Tkinter installed using apt install python3-tk, matplotlib installed in a virtualenv with pip

This is possibly related to #18186
There's also a stackoverflow question, although in that case they just save to a png and get the traceback, while if I am only saving to PNG I don't.
@jklymak
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jklymak commented May 11, 2021

@anntzer this seems related to #14134?

@jklymak jklymak added this to the v3.4.3 milestone May 11, 2021
@anntzer
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anntzer commented May 11, 2021

I can repro on 3.3.4 but that's fixed on master (since 8a8786f).

@anntzer anntzer closed this as completed May 11, 2021
@anntzer anntzer mentioned this issue May 11, 2021
Closed
@QuLogic QuLogic modified the milestones: v3.4.3, v3.4.0 May 11, 2021
@monika-o monika-o mentioned this issue Oct 12, 2021
Merged
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@QuLogic @anntzer @jklymak @MJKirk