AttributeError: delete when saving figure in jupyter lab with %matplotlib widget

Question

在 jupyterlab（版本 2.2.2）上，如果我使用 %matplotlib widget 获取交互式图形，我在保存图形时会得到一个 AttributeError。

这是一个示例代码：

%matplotlib widget
import matplotlib.pyplot as plt
import seaborn as sbs
sbs.set()
import pandas as pd
import numpy as np
import os


xy_test = pd.DataFrame({'FeatureX': np.arange(15), 'FeatureY': np.random.standard_normal(15)})

fig,ax = plt.subplots(1,1)
sbs.scatterplot(x='FeatureX', y='FeatureY', data=xy_test, ax=ax, s=70, palette='BrBG', legend='brief', edgecolor='k')
fig.tight_layout()
fig.suptitle('N=%d' %(xy_test.shape[0]));

flnm = os.path.join('testfig.png')
if not os.path.exists(flnm) or 1:
    fig.savefig(flnm, bbox_inches='tight')

导致此错误消息：

    ---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-24-795a5ae23f02> in <module>
      9 flnm = os.path.join('testfig.png')
     10 if not os.path.exists(flnm) or 1:
---> 11     fig.savefig(flnm, bbox_inches='tight')

~\AppData\Local\Continuum\anaconda3\envs\python36\lib\site-packages\matplotlib\figure.py in savefig(self, fname, transparent, **kwargs)
   2309                 patch.set_edgecolor('none')
   2310 
-> 2311         self.canvas.print_figure(fname, **kwargs)
   2312 
   2313         if transparent:

~\AppData\Local\Continuum\anaconda3\envs\python36\lib\site-packages\matplotlib\backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, pad_inches, bbox_extra_artists, backend, **kwargs)
   2223                 self.figure.set_edgecolor(origedgecolor)
   2224                 self.figure.set_canvas(self)
-> 2225             return result
   2226 
   2227     @classmethod

~\AppData\Local\Continuum\anaconda3\envs\python36\lib\contextlib.py in __exit__(self, type, value, traceback)
     86         if type is None:
     87             try:
---> 88                 next(self.gen)
     89             except StopIteration:
     90                 return False

~\AppData\Local\Continuum\anaconda3\envs\python36\lib\site-packages\matplotlib\cbook\__init__.py in _setattr_cm(obj, **kwargs)
   2064         for attr, orig in origs.items():
   2065             if orig is sentinel:
-> 2066                 delattr(obj, attr)
       2067             else:
       2068                 setattr(obj, attr, orig)

AttributeError: __delete__

图形“保存”到磁盘，我可以在某些应用程序中打开它，例如 MS Paint，但不能在 Windows 照片应用程序中打开。使用照片时，我收到“文件系统错误 (-2147219196)”。

这不会发生在 %matplotlib notebook。如何修复 %matplotlib widget 中的这个错误？

Answer 1

来自本期https://github.com/matplotlib/ipympl/issues/252
这个错误似乎是从 matplotlib 3.3.0 引入的。所以目前，我的解决方案是将 matplotlib 降级到 3.2.2。

pip install matplotlib==3.2.2

在我的环境中一切正常。

Answer 2

此后发布了新版ipyml，可以继续matplotlib 3.3.x升级ipyml

pip install --upgrade ipympl

AttributeError: delete when saving figure in jupyter lab with %matplotlib widget

AttributeError: delete when saving figure in jupyter lab with %matplotlib widget

python

matplotlib

attributeerror

jupyter-lab

AttributeError: __delete__ when saving figure in jupyter lab with %matplotlib widget

AttributeError: __delete__ when saving figure in jupyter lab with %matplotlib widget

python

matplotlib

attributeerror

jupyter-lab

AttributeError: delete when saving figure in jupyter lab with %matplotlib widget

AttributeError: delete when saving figure in jupyter lab with %matplotlib widget