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Description
Bug summary
I am trying to remove some artists (RadioButtons and CheckButtons) while keeping some others (axes with images), before exporting a figure to disk, and am running into this error:
AttributeError: 'NoneType' object has no attribute 'canvas'
as MPL is trying to check if canvas for RadioButton has changed, although that RadioButton should not part of the equation at all as it was removed prior to trying to .savefig()
Code for reproduction
import matplotlib.pyplot as plt
from matplotlib.widgets import RadioButtons
fig, ax = plt.subplots(1, 1)
radio = RadioButtons(ax, ['1', '2'], 0)
radio.ax.remove()
fig.savefig('~/Downloads/saved_after_artist_remove.png')Actual outcome
Traceback (most recent call last):
File "/Users/Reddy/dev/visualqc/visualqc/tests/artist_remove.py", line 12, in <module>
fig.savefig('~/Downloads/saved_after_artist_remove.png')
File "/usr/local/lib/python3.11/site-packages/matplotlib/figure.py", line 3343, in savefig
self.canvas.print_figure(fname, **kwargs)
File "/usr/local/lib/python3.11/site-packages/matplotlib/backend_bases.py", line 2366, in print_figure
result = print_method(
^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/matplotlib/backend_bases.py", line 2232, in <lambda>
print_method = functools.wraps(meth)(lambda *args, **kwargs: meth(
^^^^^
File "/usr/local/lib/python3.11/site-packages/matplotlib/backends/backend_agg.py", line 509, in print_png
self._print_pil(filename_or_obj, "png", pil_kwargs, metadata)
File "/usr/local/lib/python3.11/site-packages/matplotlib/backends/backend_agg.py", line 457, in _print_pil
FigureCanvasAgg.draw(self)
File "/usr/local/lib/python3.11/site-packages/matplotlib/backends/backend_agg.py", line 400, in draw
self.figure.draw(self.renderer)
File "/usr/local/lib/python3.11/site-packages/matplotlib/artist.py", line 95, in draw_wrapper
result = draw(artist, renderer, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/matplotlib/artist.py", line 72, in draw_wrapper
return draw(artist, renderer)
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/matplotlib/figure.py", line 3150, in draw
DrawEvent("draw_event", self.canvas, renderer)._process()
File "/usr/local/lib/python3.11/site-packages/matplotlib/backend_bases.py", line 1263, in _process
self.canvas.callbacks.process(self.name, self)
File "/usr/local/lib/python3.11/site-packages/matplotlib/cbook/__init__.py", line 309, in process
self.exception_handler(exc)
File "/usr/local/lib/python3.11/site-packages/matplotlib/cbook/__init__.py", line 96, in _exception_printer
raise exc
File "/usr/local/lib/python3.11/site-packages/matplotlib/cbook/__init__.py", line 304, in process
func(*args, **kwargs)
File "/usr/local/lib/python3.11/site-packages/matplotlib/widgets.py", line 1719, in _clear
if self.ignore(event) or self._changed_canvas():
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/site-packages/matplotlib/widgets.py", line 107, in _changed_canvas
return self.canvas is not self.ax.figure.canvas
^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'canvas'Expected outcome
smooth export with no error
Additional information
No response
Operating system
macOS 13
Matplotlib Version
3.7.1
Matplotlib Backend
TkAgg
Python version
3.11
Jupyter version
No response
Installation
pip