Can no longer deepcopy LogNorm objects on master #18119
Description
Bug report
Bug summary
As of 0d1d95c on the master branch it is no longer possible to deepcopy a LogNorm instance, which is a regression from 3.3.x.
Code for reproduction
import matplotlib.colors as mcolor
import copy
norm = mcolor.LogNorm()
copy.deepcopy(norm)Actual outcome
Traceback (most recent call last):
File "test.py", line 4, in <module>
copy.deepcopy(norm)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 270, in _reconstruct
state = deepcopy(state, memo)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 230, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 270, in _reconstruct
state = deepcopy(state, memo)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 146, in deepcopy
y = copier(x, memo)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 230, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File "/Users/dstansby/miniconda3/envs/dev/lib/python3.8/copy.py", line 153, in deepcopy
y = copier(memo)
File "/Users/dstansby/github/matplotlib/lib/matplotlib/transforms.py", line 143, in __copy__
raise NotImplementedError(
NotImplementedError: TransformNode instances can not be copied. Consider using frozen() instead.
Expected outcome
No error
Matplotlib version
- Operating system:
- Matplotlib version:
- Matplotlib backend (
print(matplotlib.get_backend())): - Python version:
- Jupyter version (if applicable):
- Other libraries: