Closed
Description
Bug summary
This is something I noticed downstream in networkx: networkx/networkx#5937 (comment)
Formerly, space for a Colorbar was stolen from the current Axes; that was deprecated and now in 3.6, it is stolen from the mappable's Axes. But if the mappable is not added to an Axes, it fails with a somewhat unrelated-looking error.
Code for reproduction
import matplotlib as mpl
import matplotlib.pyplot as plt
cmap = plt.get_cmap('viridis')
pc = mpl.collections.PatchCollection([], cmap=cmap)
pc.set_array([])
plt.colorbar(pc)Actual outcome
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/elliott/code/matplotlib/lib/matplotlib/pyplot.py", line 2053, in colorbar
ret = gcf().colorbar(mappable, cax=cax, ax=ax, **kwargs)
File "/home/elliott/code/matplotlib/lib/matplotlib/figure.py", line 1260, in colorbar
cax, kwargs = cbar.make_axes(ax, **kwargs)
File "/home/elliott/code/matplotlib/lib/matplotlib/colorbar.py", line 1396, in make_axes
fig = parents[0].get_figure()
AttributeError: 'NoneType' object has no attribute 'get_figure'Expected outcome
Either we should switch to the current Axes if the mappable doesn't have one (probably not desired given the previous change), or raise a clearer error message when this happens.
Additional information
No response
Operating system
No response
Matplotlib Version
3.6.0rc1
Matplotlib Backend
No response
Python version
No response
Jupyter version
No response
Installation
pip