Closed
Description
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.