Description
Bug summary
If an IPython session is started via IPython.core.interactiveshell.InteractiveShell.instance(), trying to create a matplotlib figure, or even query the backend, produces a crash (stack trace below) on OS X, and on Linux if there is an active X11 session.
Without an X session on Linux or if ipython is started via the command-line ipython command, everything works as expected.
Code for reproduction
import IPython.core.interactiveshell
IPython.core.interactiveshell.InteractiveShell.instance()
import matplotlib.pyplot
matplotlib.pyplot.figure()
# or the below crashes too
import matplotlib
matplotlib.get_backend()Actual outcome
In : matplotlib.pyplot.figure()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/zpincus/miniconda/envs/mplcrash/lib/python3.10/site-packages/matplotlib/pyplot.py", line 806, in figure
manager = new_figure_manager(
File "/Users/zpincus/miniconda/envs/mplcrash/lib/python3.10/site-packages/matplotlib/pyplot.py", line 324, in new_figure_manager
_warn_if_gui_out_of_main_thread()
File "/Users/zpincus/miniconda/envs/mplcrash/lib/python3.10/site-packages/matplotlib/pyplot.py", line 314, in _warn_if_gui_out_of_main_thread
if (_get_required_interactive_framework(_get_backend_mod())
File "/Users/zpincus/miniconda/envs/mplcrash/lib/python3.10/site-packages/matplotlib/pyplot.py", line 217, in _get_backend_mod
switch_backend(dict.__getitem__(rcParams, "backend"))
File "/Users/zpincus/miniconda/envs/mplcrash/lib/python3.10/site-packages/matplotlib/pyplot.py", line 262, in switch_backend
switch_backend(candidate)
File "/Users/zpincus/miniconda/envs/mplcrash/lib/python3.10/site-packages/matplotlib/pyplot.py", line 310, in switch_backend
install_repl_displayhook()
File "/Users/zpincus/miniconda/envs/mplcrash/lib/python3.10/site-packages/matplotlib/pyplot.py", line 150, in install_repl_displayhook
ip.enable_gui(ipython_gui_name)
File "/Users/zpincus/miniconda/envs/mplcrash/lib/python3.10/site-packages/IPython/core/interactiveshell.py", line 3455, in enable_gui
raise NotImplementedError('Implement enable_gui in a subclass')
NotImplementedError: Implement enable_gui in a subclass
Expected outcome
In : matplotlib.pyplot.figure()
<Figure size 640x480 with 0 Axes>
Additional information
The below is sufficient to reproduce the crash from a clean environment.
conda create -n "mplcrash" -c conda-forge python=3.10 matplotlib ipython
conda activate mplcrash
python -c 'import IPython.core.interactiveshell as ipsh; ipsh.InteractiveShell.instance(); import matplotlib.pyplot as plt; plt.figure()'
It's a weird corner case to be creating an ipython session this way, and perhaps the problem is on my end, but I wasn't expecting a crash like this regardless...
Operating system
macOS, Linux, maybe windows too?
Matplotlib Version
3.5.3
Matplotlib Backend
this crashes too with the same error when invoked after starting InteractiveShell.instance()
Python version
3.10.6 (but also occurs with various 3.9 versions)
Jupyter version
No response
Installation
conda