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KeyError: 'buttons' when plotting with matplotlib / ipympl backend in Jupyter Notebook within VSCode presumably due to typo #29337
Description
Using a current install of Python and notebook, matplotlib, ipympl etc. on Windows 11 within VSCode,
%matplotlib ipympl
#%matplotlib widget
import matplotlib.pyplot as plt
and
fig, ax = plt.subplots()
...
ax.plot(...)
raise KeyError: 'buttons' in c:\Users\user\AppData\Local\Programs\Python\Python313\Lib\site-packages\matplotlib\backends\backend_webagg_core.py:295
respectively
Changing the key to button resolves the error (for my use case).
Activity
[-]KeyError: 'buttons' when plotting with matplotlib / ipympl backend presumably due to type[/-][+]KeyError: 'buttons' when plotting with matplotlib / ipympl backend in Jupyter Notebook within VSCode presumably due to type[/+]timhoffm commentedon Dec 17, 2024
I haven’t looked closer, but the code has recently been touched in #28453, and it may be a typo.
rcomer commentedon Dec 17, 2024
I believe this has been addressed by matplotlib/ipympl#568
ianthomas23 commentedon Dec 17, 2024
Yes, this has been fixed on the
ipymplside as is in today's 0.9.5 release on PyPI. Theconda-forgepackage isn't available yet but it will be shortly.ianthomas23 commentedon Dec 17, 2024
But before we close the issue, can @gnbl confirm what versions of packages are installed, particularly
ipymplandmatplotlib.gnbl commentedon Dec 17, 2024
Afk, eta 14 hrs 😁
[-]KeyError: 'buttons' when plotting with matplotlib / ipympl backend in Jupyter Notebook within VSCode presumably due to type[/-][+]KeyError: 'buttons' when plotting with matplotlib / ipympl backend in Jupyter Notebook within VSCode presumably due to typo[/+]gnbl commentedon Dec 18, 2024
matplotlib 3.10.0
ipympl 0.9.4
...
Successfully installed ipympl-0.9.5
Fixed in the update! Thanks.
update ipympl
gcohn commentedon May 30, 2025
This was driving me nuts!
pip install -U ipympl>0.9.5for the win!