Description
Bug summary
A deepcopy of a Figure object results in ValueError: 'Spines' object does not contain a '__deepcopy__' spine.
This issue surfaced in a bug report of schemdraw: https://bitbucket.org/cdelker/schemdraw/issues/56/copydeepcopy-drawing-fails Nevertheless, the current issue is unrelated to schemdraw. I'm just mentioning this to illustrate a relevant use case leading to this problem.
Code for reproduction
import matplotlib.pyplot as plt
import copy
fig, ax = plt.subplots()
copy.deepcopy(fig)Disclaimer: this is taken from a message of cdelker on https://bitbucket.org/cdelker/schemdraw/issues/56/copydeepcopy-drawing-fails
Actual outcome
Traceback (most recent call last):
File "/usr/lib64/python3.9/site-packages/matplotlib/spines.py", line 551, in __getattr__
return self._dict[name]
KeyError: '__deepcopy__'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib64/python3.9/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/usr/lib64/python3.9/copy.py", line 270, in _reconstruct
state = deepcopy(state, memo)
File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/usr/lib64/python3.9/copy.py", line 230, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib64/python3.9/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/usr/lib64/python3.9/copy.py", line 270, in _reconstruct
state = deepcopy(state, memo)
File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/usr/lib64/python3.9/copy.py", line 230, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/usr/lib64/python3.9/copy.py", line 205, in _deepcopy_list
append(deepcopy(a, memo))
File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/usr/lib64/python3.9/copy.py", line 210, in _deepcopy_tuple
y = [deepcopy(a, memo) for a in x]
File "/usr/lib64/python3.9/copy.py", line 210, in <listcomp>
y = [deepcopy(a, memo) for a in x]
File "/usr/lib64/python3.9/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/usr/lib64/python3.9/copy.py", line 270, in _reconstruct
state = deepcopy(state, memo)
File "/usr/lib64/python3.9/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/usr/lib64/python3.9/copy.py", line 230, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/usr/lib64/python3.9/copy.py", line 151, in deepcopy
copier = getattr(x, "__deepcopy__", None)
File "/usr/lib64/python3.9/site-packages/matplotlib/spines.py", line 553, in __getattr__
raise ValueError(
ValueError: 'Spines' object does not contain a '__deepcopy__' spine
Expected outcome
Either a deepcopy of the figure or a meaningful error message explaining that this operation is not supported.
Operating system
Fedora Linux
Matplotlib Version
3.4.3
Matplotlib Backend
Qt5Agg
Python version
3.9.7
Jupyter version
6.1.6, (not installed)
Other libraries
None
Installation
Linux package manager (Debian/Fedora/etc.)
Conda channel
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