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[Bug]: show(block=False) freezes #28324
Description
Bug summary
Hi, I know that this topic was addressed multiple times on stackoverflow.com, but nothing worked for me. I used to use this method for almost 5 years, but my recent new installation causes this issue. Any help is greatly appreciated.
Code for reproduction
import matplotlib.pyplot as plt
plt.plot([1,2,3,5])
plt.show(block=False)Actual outcome
A new empty and frozen window. Force closing this window interrupts my iPython console as well.
Expected outcome
A new working window, I could keep working with the iPython console.
Additional information
I installed pyqt6 for the backend.
Operating system
Windows 10 and 11
Matplotlib Version
3.9.0
Matplotlib Backend
qtagg
Python version
3.10.14
Jupyter version
iPython 8.24.0
Installation
pip
Activity
ianthomas23 commentedon May 31, 2024
This is indeed a bug that I can reproduce on Linux, macOS and Windows. It only appears if using both
matplotlib >= 3.9.0andipython >= 8.24.0. There have been some significant changes behind the scenes in how Matplotlib backends are handled by IPython, and I am not surprised that some use cases have been broken by it.I will investigate and write a fix, which may be in either Matplotlib, IPython, or both. The bug only appears using
block=Falseand the default Matplotlib backend (which can vary according to OS and what backends are installed). The workaround in the short term is to specify the backend when starting IPython, either useor just start
ipythonand then usemrrezaie commentedon May 31, 2024
@ianthomas23, I appreciate your response and the workaround; it also works well for
tkagg, which I always have had problem with, byipython --matplotlib=tkor%matplotlib tk. Thanks a lot.