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Description
Describe the issue
Running the following in a Jupyter lab cell
%matplotlib ipympl
import numpy as np
import matplotlib.pyplot as plt
da = np.random.random((100, 100))
da[0, 0] = 1e-23
plt.figure()
ax = plt.pcolormesh(da, norm='log')
plt.colorbar()
plt.figure()
ax = plt.pcolormesh(da, norm='log')
plt.colorbar()
plt.tight_layout()raises
File ~/.local/share/mamba/envs/testing3/lib/python3.11/site-packages/matplotlib/_mathtext.py:2167, in Parser.parse(self, s, fonts_object, fontsize, dpi)
2164 result = self._expression.parse_string(s)
2165 except ParseBaseException as err:
2166 # explain becomes a plain method on pyparsing 3 (err.explain(0)).
-> 2167 raise ValueError("\n" + ParseException.explain(err, 0)) from None
2168 self._state_stack = []
2169 self._in_subscript_or_superscript = False
ValueError:
$\mathdefault{10^{-2}}$
^
ParseException: Expected end of text, found '$' (at char 0), (line:1, col:1)
To reproduce
Create an environment using the follwing command:
mamba create -n testing3 python=3.11 matplotlib ipympl numpy jupyter
activate the environment, start Jupyter Lab, and run the cell above.
The error does not happen without %matplotlib ipympl and it does not happen if you restrict the environment to use ipykernel<7.
Versions
(testing3) ~ $ python -c "import sys; print('\n',sys.version); import ipympl; print('ipympl version:', ipympl.__version__)" && jupyter --version && jupyter nbextension list && jupyter labextension list
3.11.14 | packaged by conda-forge | (main, Oct 22 2025, 22:46:25) [GCC 14.3.0]
ipympl version: 0.9.8
Selected Jupyter core packages...
IPython : 9.7.0
ipykernel : 7.1.0
ipywidgets : 8.1.8
jupyter_client : 8.6.3
jupyter_core : 5.9.1
jupyter_server : 2.17.0
jupyterlab : 4.4.10
nbclient : 0.10.2
nbconvert : 7.16.6
nbformat : 5.10.4
notebook : 7.4.7
qtconsole : not installed
traitlets : 5.14.3
usage: jupyter [-h] [--version] [--config-dir] [--data-dir] [--runtime-dir]
[--paths] [--json] [--debug]
[subcommand]
Jupyter: Interactive Computing
positional arguments:
subcommand the subcommand to launch
options:
-h, --help show this help message and exit
--version show the versions of core jupyter packages and exit
--config-dir show Jupyter config dir
--data-dir show Jupyter data dir
--runtime-dir show Jupyter runtime dir
--paths show all Jupyter paths. Add --json for machine-readable
format.
--json output paths as machine-readable json
--debug output debug information about paths
Available subcommands: console dejavu events execute kernel kernelspec lab
labextension labhub migrate nbconvert notebook run server troubleshoot trust
Jupyter command `jupyter-nbextension` not found.
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