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Bug summary
I've got a classCharts that usesself.fig.canvas.mpl_connect('key_press_event', self.sendEvent) to handle keypresses, which works fine. But recently I tried changing my class to subclassdict, and – oddly – this seems to confuse Matplotlib. I get the error:
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/helipad/visualize.py", line 72, in launch self.fig.canvas.mpl_connect('key_press_event', self.sendEvent) File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/matplotlib/backend_bases.py", line 2476, in mpl_connect return self.callbacks.connect(s, func) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/matplotlib/cbook/__init__.py", line 228, in connect if proxy in self._func_cid_map[signal]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^TypeError: unhashable type: 'Charts'Which is weird because I'm not passingCharts at all.
Looking at MPL's code, it looks like the_weak_or_strong_ref function is getting a reference toCharts back out of the method I passed as a callback, putting it in theproxy variable, and hashing it, which subclassingdict prevents it from doing.
Code for reproduction
importmatplotlib.pyplotaspltclassThisWorks:def__init__(self):self.fig,plots=plt.subplots(1)self.fig.canvas.mpl_connect('key_press_event',self.sendEvent)self.keyListeners= {}defsendEvent(self,event):ifevent.name=='key_press_event'andevent.keyinself.keyListeners:forfinself.keyListeners[event.key]:f(self.model,event)classThisDoesntWork(ThisWorks,dict):passx=ThisDoesntWork()
Actual outcome
Traceback (most recent call last): File "/Users/charwick/Desktop/example.py", line 15, in <module> x = ThisDoesntWork() ^^^^^^^^^^^^^^^^ File "example.py", line 6, in __init__ self.fig.canvas.mpl_connect('key_press_event', self.sendEvent) File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/matplotlib/backend_bases.py", line 2476, in mpl_connect return self.callbacks.connect(s, func) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/matplotlib/cbook/__init__.py", line 227, in connect if proxy in self._func_cid_map[signal]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^TypeError: unhashable type: 'ThisDoesntWork'Expected outcome
Code above doesn't actually do anything, but it shouldn't generate an error.
Additional information
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Operating system
MacOS 13.3.1
Matplotlib Version
3.7.1
Matplotlib Backend
No response
Python version
3.11.3
Jupyter version
No response
Installation
pip
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