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Description
Bug report
Bug summary
Withmatplotlib 3.4.0, scatter plot with colormap and legend givesTypeError: object of type 'NoneType' has no len().
Code for reproduction
importmatplotlib.pyplotasplty= [1,2,3,4,5]plt.scatter(y,y,label='Y',lw=0,s=8,c=y,cmap='viridis')plt.legend()plt.show()
Actual outcome
Traceback (most recent call last): File ".../matplotlib/backends/backend_qt5.py", line 475, in _draw_idle self.draw() File ".../matplotlib/backends/backend_agg.py", line 406, in draw self.figure.draw(self.renderer) File ".../matplotlib/artist.py", line 74, in draw_wrapper result = draw(artist, renderer, *args, **kwargs) File ".../matplotlib/artist.py", line 51, in draw_wrapper return draw(artist, renderer, *args, **kwargs) File ".../matplotlib/figure.py", line 2734, in draw mimage._draw_list_compositing_images( File ".../matplotlib/image.py", line 132, in _draw_list_compositing_images a.draw(renderer) File ".../matplotlib/artist.py", line 51, in draw_wrapper return draw(artist, renderer, *args, **kwargs) File ".../matplotlib/_api/deprecation.py", line 431, in wrapper return func(*inner_args, **inner_kwargs) File ".../matplotlib/axes/_base.py", line 2925, in draw mimage._draw_list_compositing_images(renderer, self, artists) File ".../matplotlib/image.py", line 132, in _draw_list_compositing_images a.draw(renderer) File ".../matplotlib/artist.py", line 51, in draw_wrapper return draw(artist, renderer, *args, **kwargs) File ".../matplotlib/legend.py", line 614, in draw self._legend_box.draw(renderer) File ".../matplotlib/offsetbox.py", line 368, in draw c.draw(renderer) File ".../matplotlib/offsetbox.py", line 368, in draw c.draw(renderer) File ".../matplotlib/offsetbox.py", line 368, in draw c.draw(renderer) [Previous line repeated 1 more time] File ".../matplotlib/offsetbox.py", line 694, in draw c.draw(renderer) File ".../matplotlib/artist.py", line 51, in draw_wrapper return draw(artist, renderer, *args, **kwargs) File ".../matplotlib/collections.py", line 1009, in draw super().draw(renderer) File ".../matplotlib/artist.py", line 51, in draw_wrapper return draw(artist, renderer, *args, **kwargs) File ".../matplotlib/collections.py", line 380, in draw len(facecolors) == 1 and len(edgecolors) == 1 andTypeError: object of type 'NoneType' has no len()Expected outcome
With matplotlib 3.3.4, I get this (no warning or error):
Matplotlib version
- Operating system: Red Hat Enterprise Linux Server release 7.9 (Maipo)
- Matplotlib version (
import matplotlib; print(matplotlib.__version__)): 3.4.0 - Matplotlib backend (
print(matplotlib.get_backend())): Qt5Agg - Python version: 3.8.3
- Jupyter version (if applicable): N/A
- Other libraries: Not sure what else you need, just let me know.