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[Bug]: matplotlib.cm.get_cmap() missing #28349
Description
Bug summary
As of matplotlib v3.9, it appears that matplotlib.cm.get_cmap() is missing. It is still available on matplotlib.pyplot.get_cmap(), though.
matplotlib.cm.get_cmap() is still shown in the documentation and I would be surprised if this change was made without some kind of deprecation warning.
Code for reproduction
In [1]: from matplotlib import pyplot, cm
In [2]: pyplot.get_cmap('gray')
Out[2]: <matplotlib.colors.LinearSegmentedColormap at 0x7f6b2c7303d0>
In [3]: cm.get_cmap('gray')
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
Cell In[3], line 1
----> 1 cm.get_cmap('gray')
AttributeError: module 'matplotlib.cm' has no attribute 'get_cmap'Actual outcome
AttributeError Traceback (most recent call last)
Cell In[3], line 1
----> 1 cm.get_cmap('gray')
AttributeError: module 'matplotlib.cm' has no attribute 'get_cmap'
Expected outcome
Should return the gray colormap.
Additional information
This works in matplotlib <3.9 and is still shown in the documentation. It is kind of odd that this function is available from two locations, though.
Operating system
Any
Matplotlib Version
3.9.0
Matplotlib Backend
agg
Python version
3.11.9
Jupyter version
No response
Installation
pip
Activity
greglucas commentedon Jun 5, 2024
Duplicate of #28317
This was marked with a deprecation and in 3.8.4 I get the following:
Edit: Also note that the
get_cmap()is a method onColormapRegistrythere, not at the module level. It isn't super obvious when first looking at the page.tacaswell commentedon Jun 6, 2024
We are seeing multiple reports that the warnings in 3.8 were not seen. We should sort out why and consider putting the API in a micro release with a more visible warning (at maybe a custom
AttributeErrorthat gives more context?).Get cmap from mpl.pyplot (#42)
Cleanup names of some variables
Cleanup names of some variables
Cleanup names of some variables